Skip sonar analysis for forks to avoid exposing secrets

Signed-off-by: Leonardo Carreras <leonardo.carreras@eonerc.rwth-aachen.de>

.github/workflows/sonar_cloud.yaml

@@ -11,6 +11,7 @@ jobs:
   sonarcloud:
     name: Prepare and run Sonar Scan
     runs-on: ubuntu-latest
+    if: secrets.SONAR_TOKEN != '' # Skip the job if SONAR_TOKEN is not set
     container: sogno/dpsim:dev
     env:
       BUILD_WRAPPER_OUT_DIR: build_wrapper_output_directory # Directory where build-wrapper output will be placed
@@ -53,4 +54,14 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
       run: |
-        sonar-scanner --define sonar.cfamily.compile-commands=${{ env.BUILD_WRAPPER_OUT_DIR }}/compile_commands.json
+        sonar-scanner --define sonar.cfamily.compile-commands=${{ env.BUILD_WRAPPER_OUT_DIR }}/compile_commands.json
+
+  notify-missing-token:
+    name: Notify Missing Sonar Token
+    runs-on: ubuntu-latest
+    needs: sonarcloud
+    if: ${{ needs.sonarcloud.result == 'skipped' }} # Run only if sonarcloud job was skipped
+    steps:
+      - name: Notify Missing Token
+        run: |
+          echo "SonarCloud analysis was skipped because the SONAR_TOKEN secret is not set. This is likely due to the origin repository being a fork."