chore: sync default files (#2)

.github/workflows/automation.yml

@@ -0,0 +1,28 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Automation
+on: [pull_request]
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    env:
+      PR_URL: ${{github.event.pull_request.html_url}}
+      GITHUB_TOKEN: ${{secrets.GOOGLEWORKSPACE_BOT_TOKEN}}
+    steps:
+      - name: approve
+        run: gh pr review --approve "$PR_URL"
+      - name: merge
+        run: gh pr merge --auto --squash --delete-branch "$PR_URL