[desrosj]

Part of #82934.

What?

Pins the PHP version used by the end-to-end tests to 8.1, the highest version WordPress 5.9 supports.

Why?

The end-to-end workflow sets no PHP version and .wp-env.json has no phpVersion, so wp-env builds the WordPress containers from the floating wordpress and wordpress:cli images. Those follow Docker Hub's latest tag, which is PHP 8.3 today, and they move to a new PHP version whenever Docker Hub retags latest, with no change on this branch. The unit tests already pin their PHP version through WP_ENV_PHP_VERSION. wp/5.5 ran into this: on the floating image's PHP 8.3, 10 of its end-to-end tests failed, which led to #85012 and #85013.

With this change, the end-to-end tests run on PHP 8.1, a lower version than today's PHP 8.3.

How?

.github/workflows/end2end-test.yml sets WP_ENV_PHP_VERSION: '8.1' in the workflow-level env:. wp-env already reads this variable and builds its WordPress and WP-CLI images from wordpress:php8.1 and wordpress:cli-php8.1, the same images the 8.1 unit-test legs use.

Testing Instructions

Check that the end-to-end jobs on this pull request pass.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

🤖 Generated with Claude Code

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Co-authored-by: desrosj <desrosj@git.wordpress.org>

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