ci: automatically merge dependabot PR (#181)

Author: PierreDemailly

.github/workflows/node.js.yml

@@ -33,3 +33,17 @@ jobs:
         run: npm run build
       - name: Run tests
         run: npm run test
+  automerge:
+    if: >
+      github.event_name == 'pull_request' && github.event.pull_request.user.login == 'dependabot[bot]'
+    needs:
+      - test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Merge Dependabot PR
+        uses: fastify/github-action-merge-dependabot@c3bde0759d4f24db16f7b250b2122bc2df57e817 # v3.11.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}