Onboard GitHub Actions as a replacement for Azure DevOps. #31

Job	Run time
test-modified-ports (x86-windows, windows, true)	16h 2m 29s
test-modified-ports (x64-windows, windows)	16h 37m 54s
test-modified-ports (x64-windows-static, windows)	16h 41m 46s
test-modified-ports (x64-windows-static-md, windows)	16h 24m 29s
test-modified-ports (x64-uwp, windows)	8h 14m 30s
test-modified-ports (arm64-windows, windows)	17h 2m 31s
test-modified-ports (arm64-uwp, windows)	7h 34m 40s
	4d 2h 38m 19s

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