Windows Server 2022 with Visual Studio 2022 Preview is now available in beta on GitHub-hosted runners. Use it by putting runs-on: windows-2022 in your workflow file.

    runs-on: windows-2022
      - uses: actions/checkout@v2
      - uses: actions/setup-dotnet@v1
      - name: Build
        run: dotnet build
      - name: Run tests
        run: dotnet test

The Windows Server 2022 runner image has different tools and tool versions than Windows Server 2019.

Read more on available runner images and beta images terms of use in docs.