github actions がコケたときにエラーメッセージをコメントする

Run gh pr merge --auto --merge "$PR_URL"
  gh pr merge --auto --merge "$PR_URL"
  shell: /usr/bin/bash -e {0}
  env:
    PR_URL: https://github.com/tktcorporation/tktcorporation.com/pull/144
    GITHUB_TOKEN: ***
Message: Base branch was modified. Review and try the merge again., Locations: [{Line:1 Column:58}]
Error: Process completed with exit code 1.