feat: Add automerge for dependabot and renovate-bot (GoogleCloudPlatf…

…orm#134)

.github/renovate.json

@@ -1,4 +1,5 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": ["github>GoogleCloudPlatform/cloud-foundation-toolkit//infra/terraform/test-org/github/resources/renovate"]
+  "extends": ["github>GoogleCloudPlatform/cloud-foundation-toolkit//infra/terraform/test-org/github/resources/renovate"],
+  "automerge": true
 }

.github/workflows/dependabot-automation.yaml

@@ -0,0 +1,45 @@
+# Copyright 2024 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: Dependabot automation
+
+on:  # yamllint disable-line rule:truthy
+  pull_request:
+    types:
+      - opened
+      - synchronize
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    env:
+      PR_URL: ${{github.event.pull_request.html_url}}
+      GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve the PR
+        run: gh pr review --approve "${PR_URL}"
+      - name: Enable auto-merge for PRs
+        run: gh pr merge --auto --squash --delete-branch "${PR_URL}"
+...