Don't run Desktop Framework on Linux for now

Author: sblom

.github/workflows/dotnet.yml

@@ -32,21 +32,17 @@ jobs:
         uses: gittools/actions/gitversion/execute@v0.9.7
       - name: Restore dependencies
         run: dotnet restore
-      - name: Install Mono (Linux only)
-        if: runner.os == 'Linux'
-        run: |
-          sudo apt-get update
-          # Install mono and common OpenSSL packages. Some test hosts need libssl1.1, others libssl3.
-          sudo apt-get install -y --no-install-recommends mono-devel libssl-dev libssl3 || true
-          # Try installing libssl1.1 if available (older runners/packages may require it). Ignore errors.
-          sudo apt-get install -y --no-install-recommends libssl1.1 || true
-          # Verify installation
-          mono --version || true
-          ldconfig -p | grep libssl || true
       - name: Build
         run: dotnet build --configuration Release --no-restore
       - name: Test
-        run: dotnet test --configuration Release --no-build --verbosity normal
+        run: |
+          if [ "$RUNNER_OS" = "Linux" ]; then
+            # Skip net462 on Linux (Mono/OpenSSL compatibility issues)
+            dotnet test --configuration Release --no-build --verbosity normal --framework '!net462'
+          else
+            dotnet test --configuration Release --no-build --verbosity normal
+          fi
+        shell: bash
       - run: |
           dotnet pack \
             --include-source \