Add workflow file to test build

.github/workflows/testwinuibuild.yml

@@ -0,0 +1,29 @@
+name: Uno-WinUI .NET test build
+
+on:
+  push:
+    branches: [ uno_winui ]
+
+jobs:
+  build:
+
+    runs-on: windows-2019
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 8
+    - name: Build and Pack
+      run: |
+        dotnet build Material.Icons -c Release
+        dotnet build Material.Icons.WinUI -c Release
+#        dotnet build Material.Icons.WPF -c Release
+#        dotnet build Material.Icons.Avalonia -c Release
+#    - name: Publish to Nuget
+#      run: |
+#        dotnet nuget push **/*.nupkg --api-key ${{secrets.NUGET_KEY}} --source https://api.nuget.org/v3/index.json --skip-duplicate
+#    - name: Publish to GitHub Packages
+#      run: |
+#        dotnet nuget push **/*.nupkg --api-key ${{secrets.GITHUB_TOKEN}} --source https://nuget.pkg.github.com/SKProCH/index.json --skip-duplicate