update permission

.github/workflows/ci.yml

@@ -29,3 +29,21 @@ jobs:
         run: npm ci
       - name: Run secretlint
         run: npm run lint:secret
+  dependabot:
+    runs-on: ubuntu-latest
+    needs: [actionlint, secretlint]
+    if: github.actor == 'dependabot[bot]'
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve a PR
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}