Setup vcpkg with VCPKG_ROOT, VCPKG_DEFAULT_TRIPLET, asset caching and binary caching.

VCPKG_ROOT. Default value is "$VCPKG_INSTALLATION_ROOT".

VCPKG_DEFAULT_TRIPLET. Default value is "".

• export VCPKG_ROOT. That's to say you can access it by bash's $VCPKG_ROOT or action's ${{ env.VCPKG_ROOT }}.
• export VCPKG_DOWNLOADS, which value is $GITHUB_WORKSPACE/vcpkg_downloads.
• export VCPKG_DEFAULT_TRIPLET.
• export VCPKG_DEFAULT_BINARY_CACHE, which value is $GITHUB_WORKSPACE/vcpkg_binary_cache.
• restore vcpkg cache with key setup-vcpkg-$RUNNER_OS-.
• ...
• exec post script. cache VCPKG_DOWNLOADS and VCPKG_DEFAULT_BINARY_CACHE to a single archive with the key setup-vcpkg-$RUNNER_OS-$sha256sum. sha256sum is caculated according to VCPKG_DOWNLOADS and VCPKG_DEFAULT_BINARY_CACHE.

Nothing.

- uses: mkckr0/[email protected]
  with:
    VCPKG_DEFAULT_TRIPLET: 'x64-windows-static-md'
    
- name: Install deps via vcpkg
  run: vcpkg install asio spdlog

The Visual Studio of Github Hosted Runner has a preinstalled vcpkg at C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\vcpkg. If you run vcvarsall.bat or VsDevCmd.bat, it will change VCPKG_ROOT to that version. If your CMakeLists.txt or CMakePresets.json use VCPKG_ROOT to locate the vcpkg.cmake, the issue will happen.
The simple solution is to reset VCPKG_ROOT manually.

- name: CMake Configure & Build
  run: |
    ${{ runner.os == 'Windows' && '&"$(vswhere -property installationPath)\Common7\Tools\Launch-VsDevShell.ps1" -Arch amd64 -HostArch amd64 -SkipAutomaticLocation' || ''}}
    ${{ runner.os == 'Windows' && '$env:VCPKG_ROOT=$env:VCPKG_INSTALLATION_ROOT' || '' }}
    cmake --preset windows-Release
    cmake --build --preset windows-Release