ci: add automerge workflow for dependabot

.github/workflows/maintenance.yml

@@ -0,0 +1,20 @@
+name: Auto-merge Dependabot PRs
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+permissions:
+  contents: write
+
+jobs:
+  dependabot:
+    name: 'Dependabot'
+    #needs: [build, e2e]
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' && github.event_name == 'pull_request'}}
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}