Gams CI

* Creating multi-os builds for github workflow CI (#95) #14

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Run time

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Job	Run time
Mac 12	4m 31s
Linux 20.04 g++	3m 55s
Linux 22.04 g++	3m 19s
Linux 20.04 clang	3m 40s
Linux 22.04 clang	4m 5s
	19m 30s