Reduce dependencies between steps #38

Job	Run time
Install PHP dependencies	23s
Install JS/CSS dependencies and build assets	42s
Check PHP code style	1m 22s
Check Javascript & CSS code style	45s
Prepare system tests	47s
Run PHPstan	1m 51s
Run Unit tests (8.2)	24s
Run Unit tests (8.3)	29s
Run integration tests (8.1, phpunit-pgsql.xml.dist)	52s
Run integration tests (8.2, phpunit.xml.dist)	42s
Run Unit tests (8.4)	25s
Run integration tests (8.1, phpunit.xml.dist)	45s
Run Unit tests (8.1)	29s
Run integration tests (8.3, phpunit-pgsql.xml.dist)	47s
Run integration tests (8.4, phpunit-pgsql.xml.dist)	43s
Run integration tests (8.4, phpunit.xml.dist)	42s
Run integration tests (8.3, phpunit.xml.dist)	42s
Run integration tests (8.2, phpunit-pgsql.xml.dist)	41s
Run system tests (8.4, cpostgresmax, pgsql, postgres)	12m 20s
Run system tests (8.1, cmysql, mysqli, mysql)	11m 18s
Run system tests (8.4, cmysqlmax, mysqli, mysql)	11m 25s
Run system tests (8.1, cpostgres, pgsql, postgres)	11m 37s
	1h 0m 11s

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