PHRAS-3980 custom worker (#4438) #620

Job	Run time
build phraseanet-db / build	34s
build phraseanet-fpm / build	36s
build phraseanet-elasticsearch / build	32s
build phraseanet-nginx / build	25s
build phraseanet-setup / build	35s
build phraseanet-worker / build	39s
unit test	10m 7s
	13m 28s

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