Added github workflows for CI system #4

Job	Run time
macos-gcc (9, ON, Xcode, 99)	1m 18s
macos-gcc (9, ON, Xcode, 11)	1m 21s
macos-gcc (9, ON, Ninja Multi-Config, 99)	48s
macos-gcc (9, ON, Ninja Multi-Config, 11)	49s
macos-gcc (9, OFF, Xcode, 99)	1m 20s
macos-gcc (9, OFF, Xcode, 11)	1m 18s
macos-gcc (9, OFF, Ninja Multi-Config, 99)	48s
macos-gcc (9, OFF, Ninja Multi-Config, 11)	49s
macos-gcc (10, ON, Xcode, 99)	59s
macos-gcc (10, ON, Xcode, 11)	1m 0s
macos-gcc (10, ON, Ninja Multi-Config, 99)	32s
macos-gcc (10, ON, Ninja Multi-Config, 11)	29s
macos-gcc (10, OFF, Xcode, 99)	1m 8s
macos-gcc (10, OFF, Xcode, 11)	1m 5s
macos-gcc (10, OFF, Ninja Multi-Config, 99)	32s
macos-gcc (10, OFF, Ninja Multi-Config, 11)	31s
macos-gcc (11, ON, Xcode, 99)	1m 0s
macos-gcc (11, ON, Xcode, 11)	58s
macos-gcc (11, ON, Ninja Multi-Config, 99)	28s
macos-gcc (11, ON, Ninja Multi-Config, 11)	31s
macos-gcc (11, OFF, Xcode, 99)	58s
macos-gcc (11, OFF, Xcode, 11)	1m 10s
macos-gcc (11, OFF, Ninja Multi-Config, 99)	31s
macos-gcc (11, OFF, Ninja Multi-Config, 11)	29s
	20m 52s

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