Refactor exit code handling in update script for consistency and clarity

.github/workflows/build.yaml

@@ -61,11 +61,11 @@ jobs:
       id: run_script
       run: |
         uv run src
-        EXIT_CODE=$?
-        if [ $EXIT_CODE -eq 0 ]; then
+        CODE=$?
+        if [ $CODE -eq 0 ]; then
         echo "Changes detected"
           echo "changes_detected=true" >> $GITHUB_ENV
-        elif [ $EXIT_CODE -eq 3 ]; then
+        elif [ $CODE -eq 3 ]; then
           echo "No changes detected"
           echo "changes_detected=false" >> $GITHUB_ENV
           # Transform it to 0 to avoid failing the workflow
@@ -74,7 +74,7 @@ jobs:
         else
           echo "Script failed with exit code $EXIT_CODE"
           echo "exit_code=$EXIT_CODE" >> $GITHUB_ENV
-          exit $EXIT_CODE
+          exit $CODE
         fi
 
     - name: Commit and Push Changes