ci: add dependabot auto-merge

Author: Marc Jakobi

.github/workflows/auto-merge.yml

@@ -0,0 +1,23 @@
+---
+name: Dependabot auto-approve
+on: pull_request_target
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: "${{ secrets.GH_TOKEN_FOR_UPDATES }}"
+      - name: Approve PR
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN_FOR_UPDATES }}