build: add auto-merge workflow for Dependabot

Author: NoNameProvided

.github/workflows/auto-approve-dependabot-workflow.yml

@@ -0,0 +1,23 @@
+name: Dependabot auto-merge
+on:
+  pull_request
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]'
+    steps:
+    - name: 'Auto approve PR by Dependabot'
+      uses: hmarr/[email protected]
+      with:
+        github-token: "${{ secrets.GITHUB_TOKEN }}"
+    - name: 'Comment merge command'
+      uses: actions/github-script@v3
+      with:
+        github-token: ${{secrets.GITHUB_TOKEN }}
+        script: |
+          await github.issues.createComment({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            issue_number: context.issue.number,
+            body: '@dependabot squash and merge'
+          })