ci: add go-docs file and copyright scripts

Signed-off-by: Xinwei Xiong(cubxxw-openim) <3293172751nss@gmail.com>

pkg/callbackstruct/doc.go

@@ -0,0 +1,15 @@
+// Copyright © 2023 OpenIM. All rights reserved.
+//
+// Licensed 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.
+
+package callbackstruct // import "github.com/OpenIMSDK/Open-IM-Server/pkg/callbackstruct"