updated build job to run multiple buiold for net framewrok

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -13,16 +13,20 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        netversion: [5, 6, 7, 8, 9]
+
     steps:
     - uses: actions/checkout@v3
     - name: Setup .NET 9
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 9.x
+        dotnet-version: ${{ matrix.netversion }}.x
     - name: Restore
       run: dotnet restore
     - name: Build
-      run: dotnet build --no-restore
+      run: dotnet build --no-restore 
     - name: Upload
       uses: actions/upload-artifact@v4
       with: