[skip ci] Add auto-merge action (#1908)

* [skip ci] Add auto-merge action
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* [skip ci] Update auto-merge action
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* [skip ci] Update auto-merge action
Signed-off-by: Njinhai <hai.jin@zilliz.com>

.github/workflows/automerge.yml

+name: automerge
+on:
+  pull_request:
+    types:
+      - labeled
+      - unlabeled
+      - synchronize
+      - opened
+      - edited
+      - ready_for_review
+      - reopened
+      - unlocked
+  pull_request_review:
+    types:
+      - submitted
+  check_suite: 
+    types:
+      - completed
+  status: {}
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Merge pull requests
+        uses: pascalgn/automerge-action@v0.8.0
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          MERGE_LABELS: "automerge,!work in progress"
+          MERGE_REMOVE_LABELS: "automerge"
+          MERGE_METHOD: "squash"
+          MERGE_COMMIT_MESSAGE: "pull-request-description"
+          MERGE_FORKS: "true"
+          MERGE_RETRIES: "6"
+          MERGE_RETRY_SLEEP: "10000"
+          UPDATE_LABELS: ""
+          UPDATE_METHOD: "merge"
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