一直卡在这里：
+ docker push docker.io/****/devops-java-sample:SNAPSHOT-master-20
The push refers to repository [docker.io/****/devops-java-sample]
b1a3f2b96bf3: Preparing
20dd87a4c2ab: Preparing
78075328e0da: Preparing
9f8566ee5135: Preparing
9f8566ee5135: Waiting
b1a3f2b96bf3: Pushed
9f8566ee5135: Pushed
