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Only consider versions with pre-release identifiers as pre-releases #1033

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merged 1 commit into from
Oct 11, 2019

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@fthomas fthomas commented Oct 11, 2019

This change allows updates from e.g. 8.0.192-R14 to 12.0.2-R18 (where
the 'R' stands for Release). It is currently not allowed because the
hyphen in the version number makes it a pre-release version and we
don't allow updates to a pre-release of a different version series.
With this change we require that the version acually contains a
pre-release identifier like RC, SNAPSHOT, or alpha to be considered a
pre-release version.

This change allows updates from e.g. 8.0.192-R14 to 12.0.2-R18 (where
the 'R' stands for Release). It is currently not allowed because the
hyphen in the version number makes it a pre-release version and we
don't allow updates to a pre-release of a different version series.
With this change we require that the version acually contains a
pre-release identifier like RC, SNAPSHOT, or alpha to be considered a
pre-release version.
@fthomas fthomas added the enhancement New feature or request label Oct 11, 2019
@fthomas fthomas added this to the 0.5.0 milestone Oct 11, 2019
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codecov bot commented Oct 11, 2019

Codecov Report

Merging #1033 into master will increase coverage by 0.09%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #1033      +/-   ##
==========================================
+ Coverage   69.09%   69.18%   +0.09%     
==========================================
  Files          88       88              
  Lines        1346     1350       +4     
  Branches       44       44              
==========================================
+ Hits          930      934       +4     
  Misses        416      416
Impacted Files Coverage Δ
...ain/scala/org/scalasteward/core/data/Version.scala 92.85% <100%> (+0.43%) ⬆️

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@fthomas fthomas merged commit 72e0130 into master Oct 11, 2019
@fthomas fthomas deleted the topic/tweak-Version.isPreRelease branch October 11, 2019 18:46
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
Only push 1 commit if doing a feature branch release

Fix output of job so we can get the release_type

Updating a tag requires force-pushing, and that feels bad

Comment on PR when a preview release is published

Remove troublesome backticks that confuse bash...

Ideally we would be generating a markdown message with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

### Problems with backticks

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
Only push 1 commit if doing a feature branch release

Fix output of job so we can get the release_type

Updating a tag requires force-pushing, and that feels bad

Comment on PR when a preview release is published

Remove troublesome backticks that confuse bash...

Ideally we would be generating a markdown message with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

### Problems with backticks

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
Only push 1 commit if doing a feature branch release

Fix output of job so we can get the release_type

Updating a tag requires force-pushing, and that feels bad

Comment on PR when a preview release is published

Remove troublesome backticks that confuse bash...

Ideally we would be generating a markdown message with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

### Problems with backticks

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
Only push 1 commit if doing a feature branch release

Fix output of job so we can get the release_type

Updating a tag requires force-pushing, and that feels bad

Comment on PR when a preview release is published

Remove troublesome backticks that confuse bash...

Ideally we would be generating a markdown message with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

### Problems with backticks

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
rtyley added a commit to guardian/gha-scala-library-release-workflow that referenced this pull request Jan 4, 2024
This addresses #10,
providing support for publishing *preview* releases based off feature branches, ie PRs.

The UX of doing a preview release is very similar to the existing process for doing a full
release (https://github.com/guardian/gha-scala-library-release-workflow/blob/main/docs/making-a-release.md),
with only these differences:

* The developer needs to select the PR branch before clicking the green `Run workflow` button
* The version number will be the **upcoming** version number, but with a suffix that clearly
  indicates this is a preview release, eg: `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4`.
  Note that this is _not_ a `-SNAPSHOT` release, the workflow does not support `SNAPSHOT`
  releases.
* No branches are updated by the release (ie, not the PR's feature branch, and not the
  default `main` branch) - the preview release commit exists as its own tagged commit,
  taking the latest PR commit as its parent.
* GitHub release notes will not be created, but instead the PR using that branch will be
  updated with a comment providing details of the new release (version number, etc).

Internally, these 'preview release' changes take place if a non-default branch (ie a feature
branch, not `main`) is used:

* The `🔒 Init` job `release_type` output is `PREVIEW_FEATURE_BRANCH` rather than `FULL_MAIN_BRANCH`
* Only 1 commit is pushed by the workflow, rather than 2, and _not_ onto the branch - the
  single commit exists as a tagged leaf to the side of the PR branch. The 2nd commit normally needed
  by the full release process (incrementing the version number and adding the `-SNAPSHOT`
  suffix) is not needed for preview releases - there are already enough details in the `-PREVIEW`
  version-suffix to keep preview releases unique, even if you do many releases for 1 commit in 1 PR.
* When that 1 commit is pushed, it's initially pushed with a _disposable_ Git tag - not the
  _release_ tag. Pushing _any_ commit requires either a branch or tag for the `git push` command
  to work on (you can't just push a commit id - I've tried), and there is no pre-existing suitable
  branch (we don't want to modify the PR feature branch) or tag (the release tag has an annotation
  message including the hashes of all artifact files generated by the release, and at the point
  when the commit is pushed, those artifacts & their hashes are not available yet), so we have to use
  a new, different, disposable, Git tag instead.

## Choice of version-suffix for preview releases

https://semver.org/#spec-item-9 says:

> 9. A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes. Pre-release versions have a lower precedence than the associated normal version. A pre-release version indicates that the version is unstable and might not satisfy the intended compatibility requirements as denoted by its associated normal version. Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92, 1.0.0-x-y-z.--.
>
> 10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphens [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85, 1.0.0+21AF26D3----117B344092BD.

### How can we prevent tooling from thinking our preview releases are stable releases?

If we're not using the `-SNAPSHOT` suffix, there's a risk that tooling will assume that our preview releases are stable releases, and attempt to auto-upgrade to them.

* IntelliJ automatically suggests dependency upgrades - it uses `PackageVersionNormalizer` with specific stability tokens that include 'preview'
* Scala Steward raises dependency upgrade PRs - it uses `isPreRelease` which recognises `Hash` (6+ or 8 hex chars) & specific `Alpha` components that include 'preview'. See also scala-steward-org/scala-steward#1033, scala-steward-org/scala-steward#1549 etc
* Scaladex uses PreRelease.scala - scalacenter/scaladex#614

Consequently, to be certain of being recognised as a pre-release, it seems wise to include these components in the version number:

* 'PREVIEW'
* a commit hash of at least 8 characters

### NPM version numbers...

Some Guardian libraries are released simultaneously for both Scala and other platforms like NPM
(for instance, `content-api-models`, see guardian/content-api-models#229).
Both NPM and sbt/Maven work well with simple three-number semver version numbers, but how well will
NPM handle extended version number like `1.0.7-PREVIEW.feature1.2024-01-04T1230.42ed11d4` ?

### 'PREVIEW', 'BETA', 'ALPHA', or...?

Justin points out the 'PREVIEW' has a particular meaning for the Content Pipeline team ('Preview' vs 'Live'
content) - could potentially cause some confusion there.

I initially chose 'PREVIEW' (from the identifiers that IntelliJ & Scala Steward understand) partially
because both 'BETA' & 'ALPHA' imply some meaning about the stage of development in the software release
cycle that may or may not be appropriate - it's not obvious which one truly reflects what we're doing
when we make an early release from a PR, and it's annoying to have to choose. Additionally, looking at
the Wikipedia article that describes the different stages - the label 'pre-alpha' might even be more
appropriate: https://en.wikipedia.org/wiki/Software_release_life_cycle

## Problems with backticks

Ideally we would be generating a markdown message for the PR comment with lots of backticks
for styling:

https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks

...like this:

rtyley/sample-project-using-gha-scala-library-release-workflow#1 (comment)

...but they get interpreted by BASH, and cause trouble...

https://github.com/rtyley/sample-project-using-gha-scala-library-release-workflow/actions/runs/7399435634/job/20130944058

...so for the time being this PR avoids them in the generated PR comment.
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