Add milestone use case

Author: LinuxSuRen

Jenkinsfile-milestone.groovy

@@ -0,0 +1,7 @@
+// inspired from https://stackoverflow.com/questions/40760716/jenkins-abort-running-build-if-new-one-is-started
+
+def buildNumber = env.BUILD_NUMBER as int
+if (buildNumber > 1) milestone(buildNumber - 1)
+milestone(buildNumber)
+
+sleep 20

README-zh.md

@@ -8,5 +8,6 @@
 |[Jenkinsfile-junit-k8s](Jenkinsfile-junit-k8s)|需要有一个带 `maven` 标签的代理节点。这个节点必须是在一个包含 `java` 容器的 pod 中。|生成 junit 报告。|
 |[Jenkinsfile-input](Jenkinsfile-input)|任何类型的节点。|需要用户输入，然后流水线才可以继续。|
 |[Jenkinsfile.jmeter.groovy](Jenkinsfile.jmeter.groovy)|一个 kubernetes 环境|在 Jenkins 中运行 JMeter 测试|
+|[Jenkinsfile-milestone.groovy](Jenkinsfile-milestone.groovy)|无|当有新的构建任务时，把已经运行的停止|
 
 查看更多 https://jenkins-zh.cn/about/course/#1

README.md

@@ -8,5 +8,5 @@ According to different use cases, we provide several Jenkinsfile for you:
 |[Jenkinsfile-junit-k8s](Jenkinsfile-junit-k8s)|It requires an agent which has a label `maven`. The agent should be a pod which contains a container named `java`.|Generate junit report.|
 |[Jenkinsfile-input](Jenkinsfile-input)|Any types of agent.|Require a user to input something, then the Pipeline will keep going.|
 |[Jenkinsfile.jmeter.groovy](Jenkinsfile.jmeter.groovy)|A kubernetes environment|Running a JMeter test in Jenkins|
-
+|[Jenkinsfile-milestone.groovy](Jenkinsfile-milestone.groovy)|None|Abort running build if new one is started|
 See also https://jenkins-zh.cn/about/course/#1