Update PHPUnit, CI, add support for running tests in Docker

Automattic / wp-memcached

Memcached Object Cache for WordPress.

https://wordpress.org/plugins/memcached/

GNU General Public License v2.0

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Closed sjinks closed 2 years ago

sjinks commented 2 years ago

This PR does several things:

updates PHPUnit to 9.0 - this is what the recent WordPress expects; PHPUnit 5.x is too old; phpunit.xml had to be migrated;
drops PHP 7.3 and adds PHP 8.0 to CI;
adds support to run unit tests in a Docker container.

Bonuses: