Dynamically create test matrix, take 2

[swissspidy]

Brings the matrix inline into the workflow instead of fetching it remotely from the repository.

Downside: No syntax highlighting
Upside: No need for a curl call; matrix is closer to the workflow, making it easier to grasp

Successfully tested by running this both correctly against this branch as well over at this repo

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This is the second attempt at #78

The original description is below:

How it works:

Two new jobs are added to prepare the test matrix for the actual test jobs.

The full matrix is now in a JSON string. Is then processed by jq to filter out entries where the PHP version is below minimum-php. The test jobs then use this filtered matrix with fromJson

This way we avoid unused containers from being created.

Also excludes testing.yml from syncing.

Example:

The final matrix for the unit tests will look something like this for minimum-php = 7.0:

{"include":[{"php":"7.0"},{"php":"7.0"},{"php":"7.1"},{"php":"7.1"},{"php":"7.2"},{"php":"7.2"},{"php":"7.3"},{"php":"7.3"},{"php":"7.4"},{"php":"7.4"},{"php":"8.0"},{"php":"8.0"},{"php":"8.1"},{"php":"8.1"},{"php":"8.2"},{"php":"8.2"},{"php":"7.0"},{"php":"7.0"},{"php":"7.0"},{"php":"7.4"},{"php":"8.0"},{"php":"8.0"},{"php":"8.0"},{"php":"8.1"},{"php":"8.2"},{"php":"8.3"},{"php":"8.2"}]}

For the functional tests there are of course a few more keys:

{"include":[{"php":"7.0","wp":"latest","mysql":"8.0"},{"php":"7.0","wp":"latest","dbtype":"sqlite"},{"php":"7.1","wp":"latest","mysql":"8.0"},{"php":"7.1","wp":"latest","dbtype":"sqlite"},{"php":"7.2","wp":"latest","mysql":"8.0"},{"php":"7.2","wp":"latest","dbtype":"sqlite"},{"php":"7.3","wp":"latest","mysql":"8.0"},{"php":"7.3","wp":"latest","dbtype":"sqlite"},{"php":"7.4","wp":"latest","mysql":"8.0"},{"php":"7.4","wp":"latest","dbtype":"sqlite"},{"php":"8.0","wp":"latest","mysql":"8.0"},{"php":"8.0","wp":"latest","dbtype":"sqlite"},{"php":"8.1","wp":"latest","mysql":"8.0"},{"php":"8.1","wp":"latest","dbtype":"sqlite"},{"php":"8.2","wp":"latest","mysql":"8.0"},{"php":"8.2","wp":"latest","dbtype":"sqlite"},{"php":"7.0","wp":"trunk","mysql":"8.0"},{"php":"7.0","wp":"trunk","mysql":"5.7"},{"php":"7.0","wp":"trunk","mysql":"5.6"},{"php":"7.4","wp":"trunk","mysql":"8.0"},{"php":"8.0","wp":"trunk","mysql":"8.0"},{"php":"8.0","wp":"trunk","mysql":"5.7"},{"php":"8.0","wp":"trunk","mysql":"5.6"},{"php":"8.1","wp":"trunk","mysql":"8.0"},{"php":"8.2","wp":"trunk","mysql":"8.0"},{"php":"8.3","wp":"trunk","mysql":"8.0"},{"php":"8.2","wp":"trunk","dbtype":"sqlite"},{"php":"8.3","wp":"trunk","dbtype":"sqlite"}]}

Note I'm not super familiar with jq, so these commands can probably be improved.

Aside: I also snuck a PHP 8.3 + WP trunk + SQLite test in there, which we previously didn't have.

[swissspidy]

cc @BrianHenryIE

[BrianHenryIE]

Looks to be working as expected in my dist-archive command fork:
https://github.com/BrianHenryIE/dist-archive-command/actions/runs/6738020356/workflow

With PHP 7.1:

jobs:
  test:
    uses: wp-cli/.github/.github/workflows/reusable-testing.yml@separate-matrix-v2
    with:
      minimum-php: 7.1