Test

Add basic PHPStan linter #581

Job	Run time
Lint JS & CSS	32s
Lint PHP & PHP Compatibility checks.	54s
Build	36s
Test PHP 8.3 (WP latest)	2m 8s
Test PHP 8.3 (WP trunk)	2m 24s
Test PHP 8.3 (WP 6.3)	2m 4s
Test PHP 8.2 (WP latest)	2m 2s
Test PHP 8.2 (WP trunk)	2m 7s
Test PHP 8.2 (WP 6.3)	2m 22s
Test PHP 8.1 (WP latest)	1m 59s
Test PHP 8.1 (WP trunk)	2m 9s
Test PHP 8.1 (WP 6.3)	2m 16s
Test PHP 8.0 (WP latest)	2m 2s
Test PHP 8.0 (WP trunk)	2m 29s
Test PHP 8.0 (WP 6.3)	2m 16s
Test PHP 7.4 (WP latest)	1m 57s
Test PHP 7.4 (WP trunk)	2m 17s
Test PHP 7.4 (WP 6.3)	2m 19s
Test PHP 7.3 (WP latest)	1m 55s
Test PHP 7.3 (WP trunk)	2m 5s
Test PHP 7.3 (WP 6.3)	2m 5s
Test PHP 7.2 (WP latest)	2m 16s
Test PHP 7.2 (WP trunk)	2m 9s
Test PHP 7.2 (WP 6.3)	2m 8s
	47m 31s

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