Enable auto-merge for Fern Scribe PRs

[devin-ai-integration]

Enable auto-merge for Fern Scribe PRs

Summary

Modified the Fern Scribe workflow to automatically enable auto-merge and approve PRs it creates, matching the behavior of the update-versions.yml workflow. This addresses the request from the Slack thread to set up automation for Fern Scribe PRs.

Changes:

• Updated fern-scribe.js to output the PR number via GITHUB_OUTPUT when a PR is successfully created
• Added two new workflow steps:
  1. Enable Pull Request Automerge: Uses peter-evans/enable-pull-request-automerge@v3 with squash merge method
  2. Approving PR: Uses gh pr review --approve with the PR_BOT_GH_PAT secret

The implementation follows the same pattern as the existing update-versions.yml workflow.

Review & Testing Checklist for Human

• Verify PR_BOT_GH_PAT secret exists - The workflow requires this secret for PR approval. Check that it's configured in repository secrets and has the necessary permissions
• Test with draft PRs - Fern Scribe creates draft PRs by default (line 1647 in fern-scribe.js). Verify that auto-merge can be enabled on draft PRs, or if they need to be marked "ready for review" first
• End-to-end test - Create a test issue with the fern-scribe label and verify:
  • PR is created successfully
  • PR number is captured correctly
  • Auto-merge is enabled
  • PR is approved
  • PR auto-merges when CI passes (if not a draft)

Notes

• The workflow only runs when issues are labeled with fern-scribe
• Both new steps have conditional checks: success() && steps.fern-scribe.outputs.pr-number to only run when a PR was actually created
• If the draft PR issue blocks auto-merge, you may need to either:
  • Remove the draft: true flag from the PR creation in fern-scribe.js, OR
  • Add a step to mark the PR as ready before enabling auto-merge

---

Link to Devin run: https://app.devin.ai/sessions/1fc14f49872d4da09a4ab7654f81c68e
Requested by: [email protected] (@jon-fern)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring

[github-actions]

🌿 Preview your docs: https://fern-preview-61abc2fa-4201-4512-be1a-3ff43cf3b657.docs.buildwithfern.com/learn