Merge pull request #4479 from alchemy-fr/PHRAS-4010-add-mysql8-datastore #803

Job	Run time
build phraseanet-elasticsearch / build	28s
build phraseanet-nginx / build	24m 23s
build phraseanet-db / build	32s
build phraseanet-fpm / build	25m 20s
build phraseanet-setup / build	25m 46s
build phraseanet-worker / build	25m 3s
unit test	5m 42s
	1h 47m 14s

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