Add MySQL 8 to CI (#564) #1443

Job	Run time
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 15.0)	1m 40s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 15.0)	1m 40s
mssql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 2017)	2m 30s
mssql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 2017)	2m 30s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 11.11)	1m 45s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 11.11)	1m 45s
unittest (1.13.4-erlang-24.3.4.2-alpine-3.16.0)	1m 19s
unittest (1.13.4-erlang-24.3.4.2-alpine-3.16.0)	1m 19s
mysql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 5.7)	2m 5s
mysql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 5.7)	2m 5s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 9.6)	1m 42s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 9.6)	1m 42s
unittest (1.13.4-erlang-22.3.4.20-alpine-3.14.0)	1m 21s
unittest (1.13.4-erlang-22.3.4.20-alpine-3.14.0)	1m 21s
mysql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 8.0)	2m 24s
mysql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 8.0)	2m 5s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 9.5)	1m 34s
postgres integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 9.5)	1m 34s
mssql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 2019)	3m 9s
mssql integration test (1.11.4-erlang-21.3.8.24-alpine-3.13.3, 2019)	3m 9s
	38m 39s

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