Fix GitHub Actions workflow for Windows build

[Copilot]

The existing workflow was a template with placeholder values (your-solution-name, your-test-project-path, etc.) that would fail on any run.

Changes

• Configure MSBuild to build SharpMonoInjector.sln with Debug/Release matrix
• Add NuGet package restore step
• Upload build artifacts from build/{configuration}/ (matches project output paths)
• Remove inapplicable template steps (dotnet test, code signing, WAP packaging)

- name: Restore NuGet packages
  run: nuget restore SharpMonoInjector.sln

- name: Build
  run: msbuild SharpMonoInjector.sln /p:Configuration=${{ matrix.configuration }}

- name: Upload build artifacts
  uses: actions/upload-artifact@v4
  with:
    name: SharpMonoInjector-${{ matrix.configuration }}
    path: build/${{ matrix.configuration }}/

Original prompt

please make workflow to build this github project on windows

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