ci: automerge dependabot PRs

.github/workflows/autobot.yaml

@@ -0,0 +1,28 @@
+name: Auto-merge Dependabot
+
+on: pull_request
+
+jobs:
+  automerge:
+    name: Check and merge PR
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    if: github.actor == 'dependabot[bot]'
+
+    steps:
+      - uses: dependabot/fetch-metadata@v1
+        id: metadata
+        with:
+          github-token: ${{ github.token }}
+
+      # auto merge minor releases
+      - name: Enable auto-merge
+        if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        run: gh pr merge --auto --rebase "$PR"
+        env:
+          GH_TOKEN: ${{ github.token }}
+          PR: ${{ github.event.pull_request.html_url }}