Enable auto-merge for dependabot

.github/workflows/dependabot.yml

@@ -0,0 +1,34 @@
+# https://docs.github.com/actions
+
+name: Dependabot
+
+on: pull_request_target
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  dependabot:
+    name: Auto-merge
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v1.1.1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Approve a PR
+        if: steps.dependabot-metadata.outputs.update-type != 'version-update:semver-major'
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}