fix: Add fail_on_error to block CI on actionlint failures

Co-Authored-By: AJ Steers <[email protected]>

Author: devin-ai-integration[bot]

.github/workflows/actionlint.yml

@@ -22,3 +22,4 @@ jobs:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           reporter: github-pr-review
           level: error
+          fail_on_error: true