🔧 Add GitHub Actions for CI and PR

.github/workflows/ci.yml

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+name: CI Build
+
+on:
+  push:
+    branches:
+      - master
+      - 'release/**'
+      - 'maintenance/**'
+    paths-ignore:
+      - '**/*.png'
+      - '**/*.md'
+  workflow_dispatch:
+
+env:
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+
+jobs:
+  build-and-test:
+    name: Build & Test
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        lfs: true
+
+    - name: Setup .NET SDK
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          6.0.x
+          8.0.x
+
+    - name: Setup .NET nanoFramework build components
+      uses: nanoframework/nanobuild@v1
+      with:
+        workload: 'nanoFramework'
+
+    - name: Build, Test and Pack
+      shell: pwsh
+      run: |
+        ./Build/build.ps1 -IncludeNanoFramework
+      working-directory: ${{ github.workspace }}
+
+    - name: Upload to codecov.io
+      shell: pwsh
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      run: |
+        Write-Host -Foreground Green "Downloading codecov binaries..."
+
+        Invoke-WebRequest -Uri https://uploader.codecov.io/verification.gpg -OutFile codecov.asc
+        gpg.exe --import codecov.asc
+
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe -Outfile codecov.exe
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe.SHA256SUM -Outfile codecov.exe.SHA256SUM
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe.SHA256SUM.sig -Outfile codecov.exe.SHA256SUM.sig
+
+        gpg.exe --verify codecov.exe.SHA256SUM.sig codecov.exe.SHA256SUM
+        If ($(Compare-Object -ReferenceObject  $(($(certUtil -hashfile codecov.exe SHA256)[1], "codecov.exe") -join "  ") -DifferenceObject $(Get-Content codecov.exe.SHA256SUM)).length -eq 0) { echo "SHASUM verified" } Else {exit 1}
+
+        Write-Host -Foreground Green "Uploading to codecov..."
+
+        .\codecov.exe --dir "Artifacts/Coverage" -t "$env:CODECOV_TOKEN" --build "${{ github.run_number }}"
+
+        Write-Host -Foreground Green "✅ Uploaded to codecov."
+
+    - name: Upload Artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: artifacts
+        path: Artifacts/
+        retention-days: 30
+
+    - name: Upload NuGet packages
+      uses: actions/upload-artifact@v4
+      with:
+        name: nuget-packages
+        path: |
+          Artifacts/**/*.nupkg
+          Artifacts/**/*.snupkg
+        retention-days: 30
+
+  publish-nuget:
+    name: Publish to NuGet
+    needs: build-and-test
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/master' && github.repository_owner == 'angularsen'
+    environment: Publish
+
+    steps:
+    - name: Download NuGet packages
+      uses: actions/download-artifact@v4
+      with:
+        name: nuget-packages
+        path: nugets
+
+    - name: Setup .NET SDK
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 8.0.x
+
+    - name: Push to nuget.org
+      run: |
+        dotnet nuget push "**/*.nupkg" --skip-duplicate --api-key ${{ secrets.NUGET_ORG_APIKEY }} --source https://api.nuget.org/v3/index.json
+      working-directory: nugets

.github/workflows/pr.yml

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+name: PR Build
+
+on:
+  pull_request:
+    branches:
+      - master
+      - 'release/**'
+      - 'maintenance/**'
+    paths-ignore:
+      - '*.md'
+      - '*.png'
+      - '*.gitignore'
+
+env:
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+
+jobs:
+  build-and-test:
+    name: Build & Test
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        lfs: true
+
+    - name: Setup .NET SDK
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          6.0.x
+          8.0.x
+
+    - name: Setup .NET nanoFramework build components
+      uses: nanoframework/nanobuild@v1
+      with:
+        workload: 'nanoFramework'
+
+    - name: Build, Test and Pack
+      shell: pwsh
+      run: |
+        ./Build/build.ps1 -IncludeNanoFramework
+      working-directory: ${{ github.workspace }}
+
+    - name: Upload Test Results
+      uses: actions/upload-artifact@v4
+      if: always()
+      with:
+        name: test-results
+        path: Artifacts/TestResults/*.trx
+        retention-days: 7
+
+    - name: Publish Test Results
+      uses: EnricoMi/publish-unit-test-result-action/windows@v2
+      if: always()
+      with:
+        files: |
+          Artifacts/TestResults/*.trx
+        check_name: Test Results
+        comment_mode: off
+
+    - name: Upload to codecov.io
+      shell: pwsh
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      run: |
+        Write-Host -Foreground Green "Downloading codecov binaries..."
+
+        Invoke-WebRequest -Uri https://uploader.codecov.io/verification.gpg -OutFile codecov.asc
+        gpg.exe --import codecov.asc
+
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe -Outfile codecov.exe
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe.SHA256SUM -Outfile codecov.exe.SHA256SUM
+        Invoke-WebRequest -Uri https://uploader.codecov.io/latest/windows/codecov.exe.SHA256SUM.sig -Outfile codecov.exe.SHA256SUM.sig
+
+        gpg.exe --verify codecov.exe.SHA256SUM.sig codecov.exe.SHA256SUM
+        If ($(Compare-Object -ReferenceObject  $(($(certUtil -hashfile codecov.exe SHA256)[1], "codecov.exe") -join "  ") -DifferenceObject $(Get-Content codecov.exe.SHA256SUM)).length -eq 0) { echo "SHASUM verified" } Else {exit 1}
+
+        Write-Host -Foreground Green "Uploading to codecov..."
+
+        .\codecov.exe --dir "Artifacts/Coverage" -t "$env:CODECOV_TOKEN" --build "${{ github.run_number }}"
+
+        Write-Host -Foreground Green "✅ Uploaded to codecov."
+
+    - name: Upload Artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: artifacts
+        path: Artifacts/
+        retention-days: 7

GITHUB_ACTIONS_MIGRATION_README.md

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+# GitHub Actions Migration
+
+This PR adds GitHub Actions workflows to run alongside the existing Azure Pipelines configuration.
+
+## Files to Move
+
+Due to GitHub App permission restrictions, the workflow files are created in the root directory. Please move these files to `.github/workflows/` after merging:
+
+1. `github-actions-ci.yml` → `.github/workflows/ci.yml`
+2. `github-actions-pr.yml` → `.github/workflows/pr.yml`
+
+## Key Features
+
+### CI Workflow (ci.yml)
+- Triggers on pushes to master, release/*, and maintenance/* branches
+- Builds with .NET nanoFramework support using `nanoframework/nanobuild@v1` action
+- Runs tests and uploads coverage to codecov.io
+- Publishes NuGet packages to nuget.org (only on master branch)
+- Uses Windows runner to match Azure Pipelines configuration
+
+### PR Workflow (pr.yml)
+- Triggers on pull requests to master, release/*, and maintenance/* branches
+- Same build and test process as CI workflow
+- Publishes test results as PR checks
+- Uploads test coverage to codecov.io
+- No NuGet publishing for PRs
+
+## .NET nanoFramework Support
+
+The key challenge mentioned in the issue was .NET nanoFramework support. This is handled using the `nanoframework/nanobuild@v1` GitHub Action, which is the official GitHub Actions equivalent of the Azure Pipelines `InstallNanoMSBuildComponents@1` task.
+
+## Migration Notes
+
+- Both workflows use the existing PowerShell build script (`Build/build.ps1`) with the `-IncludeNanoFramework` flag
+- Secrets needed: `CODECOV_TOKEN` and `NUGET_ORG_APIKEY` (should already be configured)
+- The workflows are designed to run alongside Azure Pipelines for comparison
+- Azure Pipelines configuration files remain unchanged as requested
+
+## Next Steps
+
+1. Move the workflow files to `.github/workflows/`
+2. Test both workflows to ensure they work correctly
+3. Compare results with Azure Pipelines
+4. Make any necessary adjustments based on testing