GitHub CI: Build with mariadb on macOS #537

Job	Run time
Build Netatalk testsuite container	1m 30s
Build Netatalk container	1m 12s
Netatalk container dry run	6s
AFP lantest	17s
AFP login test - AFP 2.1	8s
AFP spec test (Readonly) - AFP 2.1	8s
AFP login test - AFP 3.4	10s
AFP spec test - AFP 2.1	57s
AFP spec test (Readonly) - AFP 3.4	9s
AFP spec test - AFP 2.2	59s
AFP spec test - AFP 3.0	1m 7s
AFP spec test - AFP 3.1	1m 6s
AFP spec test - AFP 3.2	1m 6s
AFP spec test - AFP 3.3	1m 7s
AFP spec test - AFP 3.4	1m 10s
AFP speedtest	8s
	11m 20s

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