ci: Enable auto-merge for pre-commit.ci autoupdate PRs

Author: nfelt14

.github/workflows/auto-approve.yml

@@ -6,8 +6,15 @@ jobs:
   auto-approve:
     runs-on: ubuntu-latest
     permissions:
+      contents: write
       pull-requests: write
     if: (github.actor == 'renovate[bot]' && startsWith(github.head_ref, 'renovate/automerge/'))
       || (github.actor == 'pre-commit-ci[bot]' && startsWith(github.head_ref, 'pre-commit-ci-update-config'))
     steps:
       - uses: hmarr/auto-approve-action@f0939ea97e9205ef24d872e76833fa908a770363  # v4.0.0
+      - name: Enable auto-merge for pre-commit.ci autoupdate PRs
+        if: github.actor == 'pre-commit-ci[bot]' && startsWith(github.head_ref, 'pre-commit-ci-update-config')
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: gh pr merge --auto --merge "$PR_URL"