Test on Linux (Old GCC)

ci: add Github actions #3

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Run time

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Job	Run time
GCC 9 - C++17 - Release	1m 0s
GCC 9 - C++20 - Release	1m 9s
GCC 9 - C++17 - Debug	58s
GCC 9 - C++20 - Debug	1m 10s
	4m 17s