PHRAS-4010 uniformise db container's deployments #810

Job	Run time
build phraseanet-db / build	18s
build phraseanet-nginx / build	40s
build phraseanet-elasticsearch / build	28s
build phraseanet-fpm / build	23s
build phraseanet-setup / build	26s
build phraseanet-worker / build	28s
unit test	2m 7s
	4m 50s

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