ci: Add dependabot automation to auto-approve and enable auto-merge (#…

…269)

.github/workflows/dependabot-automation.yaml

@@ -0,0 +1,47 @@
+# Copyright 2021 D2iQ, Inc. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+name: dependabot
+
+on:
+  pull_request_target:
+    types:
+      - opened
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  auto-approve:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v1
+      - uses: actions/checkout@v3
+      - name: Approve a PR if not already approved
+        run: |
+          gh pr checkout "$PR_URL" # sets the upstream metadata for `gh pr status`
+          if [ "$(gh pr status --json reviewDecision -q .currentBranch.reviewDecision)" != "APPROVED" ]; then
+            gh pr review --approve "$PR_URL"
+          else
+            echo "PR already approved, skipping additional approvals to minimize emails/notification noise."
+          fi
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+  enable-automerge:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]'}}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v1
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}