fix whitespace

action.yml

@@ -43,9 +43,8 @@ runs:
         # Convert labels to comma separated list
         if [ -n "${{ inputs.labels }}" ]; then
           labels=$(echo "${{ inputs.labels }}" | tr '\n' ',' | sed 's/,$//')
-          if [[ "${labels: -1}" == "," ]]; then
-            labels="${labels:0:${#labels}-1}"
-          fi
+          # Remove trailing comma and whitespace
+          labels=$(echo $labels | sed 's/,$//' | sed 's/\s//g')
           echo labels=$labels >> $GITHUB_OUTPUT
         fi