Add github-binarycache option to use built in cache #78

Job	Run time
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, false)	45s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, false)	2m 20s
test-vcpkg-action (ubuntu-20.04, x64-linux-release, false)	50s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, false)	23s
test-vcpkg-action (macos-11, x64-osx-release, false)	2m 20s
test-manifest (ubuntu-20.04, x64-linux-release, false)	47s
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, true)	49s
test-vcpkg-action (windows-2019, x64-windows-release, false)	21s
test-manifest (macos-11, x64-osx-release, false)	49s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, true)	2m 17s
test-vcpkg-action (ubuntu-20.04, x64-linux-release, true)	53s
test-manifest (windows-2019, x64-windows-release, false)	21s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, true)	2m 12s
test-vcpkg-action (macos-11, x64-osx-release, true)	2m 13s
test-manifest (ubuntu-20.04, x64-linux-release, true)	1m 7s
test-vcpkg-action (windows-2019, x64-windows-release, true)	2m 34s
test-manifest (macos-11, x64-osx-release, true)	1m 12s
test-manifest (windows-2019, x64-windows-release, true)	3m 2s
	25m 15s

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