PHRAS-3901 release version 4.1.8-rc6 #321

Job	Run time
build phraseanet-worker / build	0s
build phraseanet-setup / build	1m 15s
build phraseanet-fpm / build	1m 17s
build phraseanet-db / build	36s
build phraseanet-elasticsearch / build	21s
build phraseanet-nginx / build	0s
unit test	1s
	3m 30s

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