fix: add net8 to failing workflows

Author: philasmar

.github/workflows/UploadDockerImage.yml

@@ -31,6 +31,11 @@ jobs:
       uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 #v4.3.1
       with:
         dotnet-version: 6.0.x
+     
+    - name: Setup .NET 8.0
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 #v4.3.1
+      with:
+        dotnet-version: 8.0.x
 
     - name: Restore dependencies
       run: dotnet restore

.github/workflows/doc-builder.yml

@@ -30,6 +30,10 @@ jobs:
         uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 #v4.3.1
         with:
           dotnet-version: 6.0.x
+      - name: Setup .NET 8.0
+        uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 #v4.3.1
+        with:
+          dotnet-version: 8.0.x
       - run: pip install mkdocs-material==8.2.9
       - run: pip install mkdocs-awesome-pages-plugin==2.8.0
       - name: Restore dependencies