feat: auto approve and merge pr by dependabot (#149)

Author: hopeyen

.github/workflows/auto-approve-n-merge.yml

@@ -0,0 +1,27 @@
+name: Auto approve and merge PRs by dependabot
+
+on:
+  pull_request
+
+jobs:
+  autoapprove:
+    name: Auto Approve a PR by dependabot
+    runs-on: ubuntu-latest
+    steps:
+      - name: Auto approve
+        uses: hmarr/auto-approve-action@v2.0.0
+        if: github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]'
+        with:
+          github-token: ${{ secrets.DEPENDABOT_TOKEN }}
+  automerge:
+    name: Auto merge after successful checks
+    needs: autoapprove
+    runs-on: ubuntu-latest
+    steps:
+      - name: Auto merge
+        uses: pascalgn/automerge-action@135f0bdb927d9807b5446f7ca9ecc2c51de03c4a
+        if: github.actor == 'dependabot[bot]' || github.actor == 'dependabot-preview[bot]'
+        env:
+          GITHUB_TOKEN: ${{ secrets.DEPENDABOT_TOKEN }}
+          MERGE_LABELS: dependencies
+          MERGE_METHOD: rebase