Add enable auto-merge by workflow

.github/workflows/enable-auto-merge.yml

@@ -0,0 +1,29 @@
+name: Enable auto merge
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - ready_for_review
+    branches:
+      - main
+      - v3
+
+jobs:
+  enable-auto-merge:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+      - name: Generate github token
+        id: generate_token
+        uses: tibdex/[email protected]
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.PRIVATE_KEY }}
+        env:
+          OPENSSL_CONF: /dev/null
+      - uses: alexwilson/enable-github-automerge-action@main
+        with:
+          github-token: ${{ steps.generate_token.outputs.token }}