Auto merge pre-commit auto updates (#167)

.github/workflows/automerge.yml

@@ -0,0 +1,22 @@
+name: Auto Merge
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Label PR
+        if: github.event.pull_request.title == '[pre-commit.ci] pre-commit autoupdate'
+        run: |
+          curl -X POST \
+          -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+          -H "Accept: application/vnd.github.v3+json" \
+          https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/labels \
+          -d '{"labels":["automerge"]}'
+      - name: Automatic Merge
+        uses: pascalgn/[email protected]
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"