Fix error code reporting in check_description_files.py

Author: lassoan

.github/workflows/extension-validation.yml

@@ -150,7 +150,7 @@ jobs:
           echo "Extension validation: $EXTENSION_RESULT"
 
           if [ "$STRUCTURE_RESULT" != "success" ] || [ "$EXTENSION_RESULT" != "success" ]; then
-            echo "❌ One or more validation steps failed"
+            echo "❌ One or more validation steps failed. Check \"Summary\" for more information."
             exit 1
           else
             echo "✅ All validation steps passed"

scripts/check_description_files.py

@@ -694,4 +694,5 @@ def main():
 ]
 
 if __name__ == "__main__":
-    main()
+    import sys
+    sys.exit(main())