impl: auto patch merge

.github/workflows/auto-merge.yaml

@@ -0,0 +1,32 @@
+name: Auto Merge (Dependabot)
+
+on:
+  pull_request:
+    branches: 'main'
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  AutoMerge:
+    name: Approve patch PR
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'owner/my_repo'
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/[email protected]
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+      - name: Approve a PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: Enable auto-merge for Dependabot PRs
+        if: contains(steps.metadata.outputs.dependency-names, 'my-dependency') && steps.metadata.outputs.update-type == 'version-update:semver-patch'
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}