Update backend-ci.yml

.github/workflows/backend-ci.yml

@@ -47,11 +47,15 @@ jobs:
 
       - name: Run pylint on backend
         run: |
-          pylint --exit-zero --output-format=json $(git ls-files '*.py') > pylint_report.json
-          pylint_score=$(jq '[.[] | select(.score != null) | .score] | add / length' pylint_report.json)
-          echo "Pylint score: $pylint_score"
-          if (( $(echo "$pylint_score < 8.0" | bc -l) )); then
-            echo "Pylint score too low ($pylint_score)!" && exit 1
+          changed_files=$(git diff --name-only origin/main...HEAD | grep '\.py$' || true)
+          if [ -n "$changed_files" ]; then
+            pylint $changed_files --exit-zero | tee pylint.log
+            SCORE=$(tail -n 2 pylint.log | grep -oP '[0-9]+\.[0-9]+(?=/10)')
+            echo "Pylint score: $SCORE"
+            python -c "import sys; sys.exit(0 if float('$SCORE') >= 8.0 else 1)"
+          else
+            echo "No Python files changed, skipping pylint."
+            exit 0
           fi
 
       - name: Start backend server (background)