Add kernel version (#4613) #1261

Job	Run time
build phraseanet-setup / build	3m 53s
build phraseanet-nginx / build	29s
build phraseanet-db / build	21s
build phraseanet-elasticsearch / build	25s
build phraseanet-fpm / build	3m 57s
build phraseanet-worker / build	4m 1s
unit test	2m 25s
	15m 31s

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