added multiple framewrok version setup

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -16,7 +16,23 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Setup .NET
+    - name: Setup .NET 5
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 5.x
+    - name: Setup .NET 6
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 6.x
+    - name: Setup .NET 7
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 7.x
+    - name: Setup .NET 8
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 8.x
+    - name: Setup .NET 9
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 9.x