[skip ci] Add new func of benchmark (#11314)

Signed-off-by: wangting0128 <ting.wang@zilliz.com>

tests/benchmark/milvus_benchmark/update.py

@@ -75,6 +75,33 @@ def get_config_digest(url, token):
         return ""
 
 
+def get_latest_tag(limit=200):
+
+    auth_url = ""
+    tags_url = ""
+    tag_url = ""
+
+    master_latest_digest = get_config_digest(tag_url + "master-latest", get_token(auth_url))
+    tags = get_tags(tags_url, get_token(auth_url))
+    tag_list = get_master_tags(tags)
+
+    latest_tag = ""
+    for i in range(1, len(tag_list) + 1):
+        tag_name = str(tag_list[-i])
+        tag_digest = get_config_digest(tag_url + tag_name, get_token(auth_url))
+        if tag_digest == master_latest_digest:
+            latest_tag = tag_name
+            break
+        if i > limit:
+            break
+
+    if latest_tag == "":
+        # latest_tag = "master-latest"
+        raise print("Can't find the latest image name")
+    print("The image name used is %s" % str(latest_tag))
+    return latest_tag
+
+
 def parse_server_tag(server_tag):
     """ paser server tag from server config"""
     # tag format: "8c"/"8c16m"/"8c16m1g"