Add GitHub Actions to validate UWP via CMake #2

Job	Run time
build (x64-Debug-UWP, amd64)	1m 5s
build (x64-Release-UWP, amd64)	57s
build (x64-Debug-UWP-Clang, amd64)	58s
build (x64-Release-UWP-Clang, amd64)	1m 16s
build (x86-Debug-UWP, amd64_x86)	1m 25s
build (x86-Release-UWP, amd64_x86)	40s
build (x86-Debug-UWP-Clang, amd64_x86)	48s
build (x86-Release-UWP-Clang, amd64_x86)	1m 27s
build (arm64-Debug-UWP, amd64_arm64)	57s
build (arm64-Release-UWP, amd64_arm64)	1m 14s
build (arm64-Debug-UWP-Clang, amd64_arm64)	1m 22s
build (arm64-Release-UWP-Clang, amd64_arm64)	1m 21s
	13m 30s

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