Add GitHub actions #18

Job	Run time
build (ubuntu-22.04, Debug, client_only, 5.15.2, 5.15)	12m 21s
build (ubuntu-22.04, Debug, client_only, 6.5.3, 6.5.*, qtshadertools)	16m 22s
build (ubuntu-22.04, Debug, client_and_ui, 5.15.2, 5.15)	11m 17s
build (ubuntu-22.04, Debug, client_and_ui, 6.5.3, 6.5.*, qtshadertools)	20m 27s
build (windows-2022, Debug, client_only, 5.15.2, 5.15)	22m 34s
build (windows-2022, Debug, client_only, 6.5.3, 6.5.*, qtshadertools)	32m 26s
build (windows-2022, Debug, client_and_ui, 5.15.2, 5.15)	22m 32s
build (windows-2022, Debug, client_and_ui, 6.5.3, 6.5.*, qtshadertools)	33m 29s
build (macos-12, Debug, client_only, 5.15.2, 5.15)	13m 4s
build (macos-12, Debug, client_only, 6.5.3, 6.5.*, qtshadertools)	18m 31s
build (macos-12, Debug, client_and_ui, 5.15.2, 5.15)	13m 46s
build (macos-12, Debug, client_and_ui, 6.5.3, 6.5.*, qtshadertools)	17m 10s
	3h 53m 59s

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