git获取最新的tag

1、拉取代码，获取最新的tag

stage('拉取代码') {
        checkout([$class: 'GitSCM', branches: [[name: "*/${branch}"]], extensions: [], userRemoteConfigs: [[credentialsId: "${git_auth}", url: "${gitlab_url}"]]])
        build_tag = sh(returnStdout: true, script: 'git rev-parse --short HEAD').trim()
        version = build_tag
    }