PHRAS-3901 release version 4.1.8-rc6 #303

Job	Run time
build phraseanet-nginx / build	3m 3s
build phraseanet-fpm / build	4m 30s
build phraseanet-worker / build	4m 49s
build phraseanet-setup / build	3m 54s
build phraseanet-db / build	36s
build phraseanet-elasticsearch / build	39s
unit test	7m 26s
	24m 57s

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