Add github-binarycache option to use built in cache #72

Job	Run time
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, false)	50s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, false)	49s
test-manifest (ubuntu-20.04, x64-linux-release, false)	48s
test-vcpkg-action (ubuntu-20.04, x64-linux-release, false)	39s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, false)	28s
test-manifest (macos-11, x64-osx-release, false)	1s
test-vcpkg-action (macos-11, x64-osx-release, false)	37s
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, true)	50s
test-manifest (windows-2019, x64-windows-release, false)	32s
test-vcpkg-action (windows-2019, x64-windows-release, false)	20s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, true)	48s
test-manifest (ubuntu-20.04, x64-linux-release, true)	58s
test-vcpkg-action (ubuntu-20.04, x64-linux-release, true)	41s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, true)	38s
test-manifest (macos-11, x64-osx-release, true)	56s
test-vcpkg-action (macos-11, x64-osx-release, true)	37s
test-manifest (windows-2019, x64-windows-release, true)	45s
test-vcpkg-action (windows-2019, x64-windows-release, true)	27s
	11m 44s

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