ci: avoid sonar branch analysis on community edition

.forgejo/workflows/build.yml

@@ -61,15 +61,22 @@ jobs:
           echo "Sample files:"
           find . -maxdepth 2 -type f | head -n 20
           echo "Running local sonar-scanner..."
-          sonar-scanner \
+          set -- \
             -Dsonar.host.url="$HOST_URL" \
             -Dsonar.token="$SONAR_TOKEN" \
             -Dsonar.projectKey="$PROJECT_KEY" \
-            -Dsonar.branch.name="$BRANCH_NAME" \
             -Dsonar.sources=. \
             -Dsonar.scm.disabled=true \
             -Dsonar.projectBaseDir="$WORKDIR"
 
+          if [ "${SONAR_ENABLE_BRANCH:-}" = "true" ]; then
+            set -- "$@" -Dsonar.branch.name="$BRANCH_NAME"
+          else
+            echo "Branch analysis disabled (requires SonarQube Developer Edition)"
+          fi
+
+          sonar-scanner "$@"
+
   docker:
     needs: [lint, sonar]
     runs-on: self-hosted