ci(gh actions): add auto-merge pr workflow for dependabot

.github/workflows/auto-merge-dependabot-pr.yml

@@ -0,0 +1,28 @@
+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  tests:
+    uses: ./.github/workflows/test.yml
+  dependabot:
+    name: "Auto-merge Dependabot PR"
+    runs-on: ubuntu-latest
+    needs: tests
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Enable auto-merge for Dependabot PRs
+        # (fixes, features but not major upgrades!)
+        if: ${{steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}