golang 用户名密码认证docker，并推送镜像至仓库

import  (client2 "github.com/docker/docker/client")

authConfig := types.AuthConfig{Username: "admin", Password: "123456"}
var encodedJSON []byte
encodedJSON, err = json.Marshal(authConfig)
if err != nil {
   return err
}
authStr := base64.URLEncoding.EncodeToString(encodedJSON)

cli, err := client2.NewClientWithOpts(client2.WithAPIVersionNegotiation())

pushReader, err = cli.ImagePush(context.Background(), imgName, types.ImagePushOptions{
   All:           false,
   RegistryAuth:  authStr,
   PrivilegeFunc: nil,
})