Add github-binarycache option to use built in cache #75

Job	Run time
test-vcpkg-action (ubuntu-20.04, x64-linux-release, false)	56s
test-vcpkg-action (macos-11, x64-osx-release, false)	2m 14s
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, false)	52s
test-vcpkg-action (windows-2019, x64-windows-release, false)	20s
test-manifest (ubuntu-20.04, x64-linux-release, false)	54s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, false)	45s
test-vcpkg-action (ubuntu-20.04, x64-linux-release, true)	38s
test-manifest (macos-11, x64-osx-release, false)	54s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, false)	19s
test-vcpkg-action (macos-11, x64-osx-release, true)	2m 28s
test-manifest (windows-2019, x64-windows-release, false)	21s
test-vcpkg-action-latest-vcpkg-release (ubuntu-20.04, x64-linux-release, true)	19s
test-vcpkg-action (windows-2019, x64-windows-release, true)	1m 48s
test-manifest (ubuntu-20.04, x64-linux-release, true)	39s
test-vcpkg-action-latest-vcpkg-release (macos-11, x64-osx-release, true)	2m 10s
test-manifest (macos-11, x64-osx-release, true)	45s
test-vcpkg-action-latest-vcpkg-release (windows-2019, x64-windows-release, true)	1m 16s
test-manifest (windows-2019, x64-windows-release, true)	1m 51s
	19m 29s

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