Add zip extension to unit test PHP setup

[Copilot]

The zip extension was configured in setup-php for functional tests but omitted from the unit test step, causing an inconsistency.

Change

• Added extensions: zip to the setup-php step in the unit tests job of reusable-testing.yml

- name: Set up PHP environment
  uses: shivammathur/setup-php@...
  with:
    php-version: '${{ matrix.php }}'
    ini-values: zend.assertions=1, error_reporting=-1, display_errors=On
    extensions: zip   # was missing
    coverage: ${{ matrix.coverage && 'xdebug' || 'none' }}
    tools: composer,cs2pr

Functional tests already include zip (alongside gd, imagick, mysql, pdo_sqlite).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Install zip extension</issue_title>
<issue_description> the zip extension is included in setup-php for functional tests but missing for unit tests in reusable-testing.yml.</issue_description>

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

• Fixes Install zip extension #214

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

Pull request overview

Aligns the unit test PHP environment with the functional test setup by ensuring the zip PHP extension is installed during unit test runs, removing an inconsistency in CI configuration.

Changes:

• Add extensions: zip to the shivammathur/setup-php step in the unit tests job within the reusable testing workflow.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.