CI: Add github workflow using Apple M #15

Job	Run time
build (cmake, gfortran, 0, 0)	13m 20s
build (cmake, gfortran, 0, 1)	1h 29m 9s
build (cmake, gfortran, 1, 0)	23m 51s
build (cmake, gfortran, 1, 1)	24m 34s
build (cmake, /opt/homebrew/opt/llvm/bin/flang-new, 0, 0)	1m 33s
build (cmake, /opt/homebrew/opt/llvm/bin/flang-new, 0, 1)	1m 21s
build (cmake, /opt/homebrew/opt/llvm/bin/flang-new, 1, 0)	1m 36s
build (cmake, /opt/homebrew/opt/llvm/bin/flang-new, 1, 1)	1m 13s
build (make, gfortran, 0, 0)	8m 14s
build (make, gfortran, 0, 1)	7m 48s
build (make, gfortran, 1, 0)	7m 39s
build (make, gfortran, 1, 1)	7m 21s
build (make, /opt/homebrew/opt/llvm/bin/flang-new, 0, 0)	5m 41s
build (make, /opt/homebrew/opt/llvm/bin/flang-new, 0, 1)	4m 11s
build (make, /opt/homebrew/opt/llvm/bin/flang-new, 1, 0)	5m 8s
build (make, /opt/homebrew/opt/llvm/bin/flang-new, 1, 1)	4m 14s
	3h 26m 53s

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