ci: adding avalonia build and testing

Author: lookbusy1344

.github/workflows/ci.yml

@@ -71,3 +71,26 @@ jobs:
       - name: Run Swift tests
         working-directory: swift-gui
         run: xcodebuild test -project ARMEmulator.xcodeproj -scheme ARMEmulator -destination 'platform=macOS' | xcbeautify
+
+  avalonia-gui:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Restore dependencies
+        working-directory: avalonia-gui
+        run: dotnet restore
+
+      - name: Build Avalonia app
+        working-directory: avalonia-gui
+        run: dotnet build --no-restore
+
+      - name: Run Avalonia tests
+        working-directory: avalonia-gui
+        run: dotnet test --no-build --verbosity normal