ci: add GitHub workflow for automatic PR rebase (#1243)

Add a GitHub Actions workflow to enable automatic rebasing of pull requests via comment commands `/rebase` and `/autosquash`

The workflow allows repository collaborators to trigger a rebase of a pull request by commenting `/rebase` or perform an autosquash rebase with `/autosquash`.

Signed-off-by: drivebyer <wuyangmuc@gmail.com>

Author: drivebyer

.github/workflows/auto-rebase.yaml

@@ -0,0 +1,31 @@
+name: Automatic Rebase
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  rebase:
+    name: Rebase
+    if: >-
+      github.event.issue.pull_request != '' && 
+      (
+        contains(github.event.comment.body, '/rebase') || 
+        contains(github.event.comment.body, '/autosquash')
+      )
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout the latest code
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+      - name: Automatic Rebase
+        uses: cirrus-actions/rebase@1.8
+        with:
+          autosquash: ${{ contains(github.event.comment.body, '/autosquash') || contains(github.event.comment.body, '/rebase-autosquash') }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}