message: switch to markdown comment tag
diff: @@ -45,15 +45,14 @@ jobs:
  });
  if (comments.find((c) =>
  c.user.login === "github-actions[bot]" &&
  - c.body.includes("<dco-helper>")
  + c.body.includes("<!-- dco -->")
  )
  ) {
  console.log(`already commented on PR #${pull.number}, skipping`);
  continue;
  }
  -
  console.log(`creating comment on PR #${pull.number}`);
  - const body = `Thanks for the contribution!\nAll commits need to be DCO signed before merging. Please refer to the the [DCO section in CONTRIBUTING.md](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md#developer-certificate-of-origin) or the [DCO](${checks.data.check_runs[0].html_url}) status for more info.<dco-helper>`;
  + const body = `Thanks for the contribution!\nAll commits need to be DCO signed before merging. Please refer to the the [DCO section in CONTRIBUTING.md](https://github.com/backstage/backstage/blob/master/CONTRIBUTING.md#developer-certificate-of-origin) or the [DCO](${checks.data.check_runs[0].html_url}) status for more info.<!-- dco -->`;
  await github.rest.issues.createComment({
  repo,
  owner,
  