PHRAS-4149 Update stack.md #1275

Job	Run time
build phraseanet-worker / build	45s
build phraseanet-db / build	22s
build phraseanet-nginx / build	25s
build phraseanet-fpm / build	30s
build phraseanet-setup / build	26s
build phraseanet-elasticsearch / build	21s
unit test	5m 42s
	8m 31s

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