Add PCOV to PHP 8.0-8.5 images

[desrosj]

wordpress-develop is looking to switch off of xDebug for generating code coverage reports in favor of using PCOV (see WordPress/wordpress-develop#11618). While it's possible to install and configure PCOV in the GitHub Actions workflow file that generates coverage reports, it would be nice to have this pre-installed within the Docker containers so that a contributor could easily use PCOV locally.

This introduces PCOV into all non-legacy PHP images (currently 7.4-8.5).

Note: This is blocked by #209. In order to not include the changes to common.sh in the 7.2 & 7.3 containers, those must be moved to legacy first or the workflows will fail due to the presence of uncommitted changes to versioned files after running php update.php.

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[Copilot]

Pull request overview

This PR adds the PCOV PECL extension to the WordPress development PHP Docker images so contributors can generate code coverage locally without relying on Xdebug.

Changes:

• Add pcov to the PECL extensions installed in generated PHP images (via update.php).
• Install PCOV in the generated Dockerfiles for the targeted PHP versions.
• Add an entrypoint toggle (LOCAL_PHP_PCOV=true) to enable/disable the PCOV extension at runtime.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
update.php	Adds pcov to the pecl_extensions list so generated PHP Dockerfiles install it.
entrypoint/common.sh	Adds LOCAL_PHP_PCOV handling to enable/disable the PCOV extension at container start.
images/7.4/php/Dockerfile	Installs PCOV via pecl install pcov.
images/7.4/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 7.4 image runtime.
images/8.0/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.0/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.0 image runtime.
images/8.1/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.1/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.1 image runtime.
images/8.2/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.2/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.2 image runtime.
images/8.3/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.3/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.3 image runtime.
images/8.4/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.4/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.4 image runtime.
images/8.5/php/Dockerfile	Installs PCOV via pecl install pcov.
images/8.5/php/common.sh	Adds LOCAL_PHP_PCOV handling for the 8.5 image runtime.

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