Chore: Add basic 'integration' tests to ensure code style is being pr… #741

Job	Run time
Markdown link check	23s
Code style and static analysis	30s
PHP 8.0	34s
PHP 8.1	34s
PHP 8.2	43s
PHP 8.3	33s
PHP 8.0 --prefer-lowest --prefer-stable	36s
tests-finished	5s
	3m 58s

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