Harmonize CI & files (#35) #39

Job	Run time
Tests / Fetch supported versions	5s
Tests / Static analysis	27s
Tests / Bare minimum - Special case - Symfony 5.4	25s
Tests / Up to date versions	16s
Tests / Up to date versions - Special case - Symfony 5.4	14s
Tests / Late migration - PHP	15s
Tests / Bare minimum	12s
Tests / Late migration - Symfony	18s
Tests / Nightly - PHP - With lowest supported Symfony versions	26s
Tests / Nightly - PHP - With highest supported Symfony versions	17s
Tests / Nightly - Symfony - With highest supported PHP version	20s
Tests / Nightly - Symfony - With lowest supported PHP version	24s
	3m 39s

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