Add Dependabot GH-Action - Auto-approve / -merge

.github/workflows/dependabot_automerge.yml

@@ -0,0 +1,18 @@
+name: Dependabot auto-approve / -merge
+on: pull_request
+
+jobs:
+  dependabot:
+    permissions:
+      contents: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    env:
+      PR_URL: ${{github.event.pull_request.html_url}}
+      GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Approve a PR
+        run: gh pr review --approve "$PR_URL"
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --squash "$PR_URL"

README.md

@@ -113,3 +113,12 @@ It just requires some manual adjustments/settings depending on your project:
 ## Contribute
 
 You are very welcome to contribute to this template repository by opening a pull request against the main branch.
+
+### GitHub Actions
+
+- Dependabot auto-approve / -merge:
+  - If the actor is the Dependabot bot (i.e. on every commit by Dependabot)
+    the pull request is automatically approved and auto merge gets activated
+    (using squash merge).
+    Note that if you haven't enabled "auto merge" for your repository, the auto merge activation will fail.
+    If you want to use a merge type other than "squash merge" you have to edit the workflow.