node{
    docker.image('buildpack-deps:jessie-scm').inside {
        sh "echo 'hello' >> a.txt"
        stash includes: 'a.txt', name: 'pom'
    }
    
     docker.image('buildpack-deps:jessie-scm').inside {
         unstash 'pom'
         sh "cat a.txt"
     }
}