ci: do not auto-merge draft pull requests (#282)

Provide a mechanism for testing workflows that create pull requests.

.github/workflows/pr.yml

@@ -14,7 +14,7 @@ jobs:
           app_id: ${{ secrets.APP_ID }}
           private_key: ${{ secrets.APP_PRIVATE_KEY }}
       - name: Automerge Bot Pull Requests
-        if: ${{ github.actor == 'cadobot[bot]' }}
+        if: github.actor == 'cadobot[bot]' && !github.event.pull_request.draft
         run: gh pr merge --auto --squash "${{ github.event.pull_request.html_url }}"
         env:
           GITHUB_TOKEN: ${{ steps.bot.outputs.token }}