Add dependabot reviewer (#1275)

.github/workflows/dependabot-reviewer.yml

@@ -0,0 +1,27 @@
+name: Dependabot reviewer
+
+on: pull_request_target
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  review-dependabot-pr:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/[email protected]
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.DEPENDABOT_TOKEN}}
+      - name: Approve patch updates
+        if: ${{steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch'}}
+        run: gh pr review $PR_URL --approve -b "I'm **approving** this pull request because **it includes a patch update**"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.DEPENDABOT_TOKEN}}