PHRAS-4010 Add mysql8 as alternative datastore (#4477) #797

Job	Run time
build phraseanet-fpm / build	36s
build phraseanet-nginx / build	37s
build phraseanet-db / build	27s
build phraseanet-setup / build	40s
build phraseanet-worker / build	24s
build phraseanet-elasticsearch / build	23s
unit test	5m 44s
	8m 51s

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