skipOnAutomatedBranches() does not work as expected, take 2

[SergeyBiryukov]

Background: #39486, #49050, #50401, #54112.

As part of the changes in [51868] / #54112, the GITHUB_REF and GITHUB_EVENT_NAME environment variables added in [49267] are no longer passed to the Docker container, which breaks the skipOnAutomatedBranches() method and causes it to still run on branches other than trunk.

This was never noticed before, as most of these tests check the year in license.txt, the version in package.json, the year in bundled themes' readme.txt, etc. By the time WordPress 5.9 was released in January, all of these files were already updated.

Summary of the changes in the attached patch:

• Pass the GITHUB_REF and GITHUB_EVENT_NAME environment variables to the Docker container, so that they are available to PHPUnit.
• Update the 'refs/heads/trunk' !== $github_ref condition to account for renaming the master branch to trunk in November 2021, following the ​decision made in June 2020.
• Remove obsolete references to the master branch in favor of trunk.
• Remove the redundant 'false' !== $github_event_name condition. It appears to be copied in [49267] from 'false' !== $travis_pull_request added in [47000]. Based on the list of ​events that trigger workflows, the event name can never be 'false' as a string.

[SergeyBiryukov]

In 53349:

Build/Test Tools: Pass GitHub Actions environment variables to the Docker container.

This ensures that WP_UnitTestCase::skipOnAutomatedBranches() has access to the GITHUB_REF and GITHUB_EVENT_NAME variables, so that some tests can be skipped when appropriate.

Additionally, account for renaming the master branch to trunk in November 2021.

Follow-up to [40241], [46999], [49264], [49267], [51868].

Fixes #55668.

[SergeyBiryukov]

Reopening for backporting to the 6.0 and 5.9 branches after a second committer's review.

[peterwilsoncc]

Approved for backporting.

[SergeyBiryukov]

In 53350:

Build/Test Tools: Pass GitHub Actions environment variables to the Docker container.

This ensures that WP_UnitTestCase::skipOnAutomatedBranches() has access to the GITHUB_REF and GITHUB_EVENT_NAME variables, so that some tests can be skipped when appropriate.

Additionally, account for renaming the master branch to trunk in November 2021.

Follow-up to [40241], [46999], [49264], [49267], [51868].

Merges [53349] to the 6.0 branch.
Fixes #55668.

[SergeyBiryukov]

In 53351:

Build/Test Tools: Pass GitHub Actions environment variables to the Docker container.

This ensures that WP_UnitTestCase::skipOnAutomatedBranches() has access to the GITHUB_REF and GITHUB_EVENT_NAME variables, so that some tests can be skipped when appropriate.

Additionally, account for renaming the master branch to trunk in November 2021.

Follow-up to [40241], [46999], [49264], [49267], [51868].

Merges [53349] to the 5.9 branch.
Fixes #55668.

[SergeyBiryukov]

Moving this to 6.0.1 to clear the 5.9.4 milestone, it was the only ticket there.