[skip e2e] Add license for docke mirror (milvus-io#15052)

Signed-off-by: Jenny Li <jing.li@zilliz.com>

Author: Jenny Li

build/set_docker_mirror.sh

@@ -1,4 +1,20 @@
 #!/usr/bin/env bash
+
+# Licensed to the LF AI & Data foundation under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 # Use Internal docker mirror to solve  https://www.docker.com/increase-rate-limits
 
 # Exit immediately for non zero status