Add MySQL 8.4 LTS to test matrix

[Copilot]

MySQL 8.4 is the current LTS release. The mysql_native_password plugin is no longer loaded by default, breaking authentication without explicit configuration.

Changes

• Test matrix: Added MySQL 8.4 configurations for PHP 8.3, 8.4, 8.5, and nightly across WordPress latest and trunk (7 new matrix entries)

• Authentication config: Added version detection step that conditionally applies:

  • MySQL 8.4: mysql_native_password=ON + authentication_policy=mysql_native_password,
  • MySQL ≤8.0, MariaDB: default_authentication_plugin=mysql_native_password (unchanged)

The configuration step runs before MySQL setup:

- name: Determine MySQL authentication configuration
  run: |
    if [[ "${{ matrix.mysql }}" == *"mysql-8.4"* ]]; then
      echo "auth-config<<EOF" >> $GITHUB_OUTPUT
      echo "mysql_native_password=ON" >> $GITHUB_OUTPUT
      echo "authentication_policy=mysql_native_password," >> $GITHUB_OUTPUT
      echo "EOF" >> $GITHUB_OUTPUT
    else
      echo "auth-config=default_authentication_plugin=mysql_native_password" >> $GITHUB_OUTPUT
    fi

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• php.watch
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Run tests against MySQL 8.4</issue_title>
<issue_description>MySQL 8.4 is the current LTS release.

The mysql_native_password extension isn't loaded by default anymore in that release, so that might require some work.

See https://php.watch/articles/fix-php-mysql-84-mysql_native_password-not-loaded</issue_description>

<agent_instructions>Find a way to improve the matrix in the reusable-testing workflow and add this version ti the mix</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Run tests against MySQL 8.4 #115

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[Copilot]

Pull request overview

This PR adds MySQL 8.4 LTS support to the test matrix by introducing 7 new test configurations and implementing version-specific authentication handling for MySQL 8.4's changed mysql_native_password plugin behavior.

Changes:

• Added 7 MySQL 8.4 test matrix entries for PHP 8.3, 8.4, 8.5, and nightly across WordPress latest and trunk
• Implemented conditional MySQL authentication configuration that detects MySQL 8.4 and applies the appropriate authentication settings (mysql_native_password=ON and authentication_policy=mysql_native_password, for MySQL 8.4, versus default_authentication_plugin=mysql_native_password for older versions)

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