* Add _set_github_output function

* Use _set_github_output in Action

* Add _log function

* Use _log in Action and fix Test Cases

* Update wording in log messages

* Update note about removal of old output syntax

Logic is now encapuslated in a single function. I don’t mind keeping it around until spring / June 2023

Closes #281

Starting February 2nd 2023, GitHub changed the default permissions of the GITHUB_TOKEN to be read-only in all new repositories.[1]

git-auto-commits needs `write`-permissions for the `contents`-key in order to work properly.
This commits updates the usage section, to mention the need for the permission requirements. The examples have also been updated to reflect that change.

[1]: https://github.blog/changelog/2023-02-02-github-actions-updating-the-default-github_token-permissions-to-read-only/

Bumps [bats](https://github.com/bats-core/bats-core) from 1.8.2 to 1.9.0.
- [Release notes](https://github.com/bats-core/bats-core/releases)
- [Changelog](https://github.com/bats-core/bats-core/blob/master/docs/CHANGELOG.md)
- [Commits](bats-core/bats-core@v1.8.2...v1.9.0)

---
updated-dependencies:
- dependency-name: bats
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Update docs section about using the Action in public forks.

Add warning about current issue when the forks lives under an organisation.

Mark section about running a workflow in the head repository as outdated, as I was not able to reproduce this in test projects.

See #211 (comment) for more details.

Bumps [github/super-linter](https://github.com/github/super-linter) from 4 to 5.
- [Release notes](https://github.com/github/super-linter/releases)
- [Changelog](https://github.com/github/super-linter/blob/main/docs/release-process.md)
- [Commits](github/super-linter@v4...v5)

---
updated-dependencies:
- dependency-name: github/super-linter
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [bats](https://github.com/bats-core/bats-core) from 1.9.0 to 1.10.0.
- [Release notes](https://github.com/bats-core/bats-core/releases)
- [Changelog](https://github.com/bats-core/bats-core/blob/master/docs/CHANGELOG.md)
- [Commits](bats-core/bats-core@v1.9.0...v1.10.0)

---
updated-dependencies:
- dependency-name: bats
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

#302 (comment)

Co-authored-by: ryudai.takai