Automerge (#1981)

* [skip ci] add mergify config

Signed-off-by: jinhai <hai.jin@zilliz.com>

* [skip ci] update mergify config

Signed-off-by: jinhai <hai.jin@zilliz.com>

* [skip ci] update changelog

Signed-off-by: jinhai <hai.jin@zilliz.com>

.mergify/config.yml

@@ -1,7 +1,18 @@
 pull_request_rules:
     - name: Automatic merge on approval
       conditions:
+        - "label=automerge"
         - "#approved-reviews-by>=1"
+        - "#review-requested=0"
+        - "#changes-requested-reviews-by=0"
+        - "#commented-reviews-by=0"
       actions:
         merge:
-          method: merge
+          method: squash
+
+    - name: Ask to resolve conflict
+      conditions:
+        - conflict
+      actions:
+        comment:
+          message: This pull request is now in conflicts. Could you fix it? 🙏