worker/jenkinsfile with Per stage agent as well as conditional execution.

Jenkinsfile

pipeline {

  agent none

  stages{
      stage("build"){
        when{
            changeset "**/worker/**"
          }

        agent{
          docker{
            image 'maven:3.6.1-jdk-8-slim'
            args '-v $HOME/.m2:/root/.m2'
          }
        }

        steps{
          echo 'Compiling worker app..'
          dir('worker'){
            sh 'mvn compile'
          }
        }
      }
      stage("test"){
        when{
          changeset "**/worker/**"
        }
        agent{
          docker{
            image 'maven:3.6.1-jdk-8-slim'
            args '-v $HOME/.m2:/root/.m2'
          }
        }
        steps{
          echo 'Running Unit Tets on worker app..'
          dir('worker'){
            sh 'mvn clean test'
           }

          }
      }
      stage("package"){
        when{
          branch 'master'
          changeset "**/worker/**"
        }
        agent{
          docker{
            image 'maven:3.6.1-jdk-8-slim'
            args '-v $HOME/.m2:/root/.m2'
          }
        }
        steps{
          echo 'Packaging worker app'
          dir('worker'){
            sh 'mvn package -DskipTests'
            archiveArtifacts artifacts: '**/target/*.jar', fingerprint: true
          }

        }
      }

      stage('docker-package'){
          agent any
          when{
            changeset "**/worker/**"
            branch 'master'
          }
          steps{
            echo 'Packaging worker app with docker'
            script{
              docker.withRegistry('https://index.docker.io/v1/', 'dockerlogin') {
                  def workerImage = docker.build("initcron/worker:v${env.BUILD_ID}", "./worker")
                  workerImage.push()
                  workerImage.push("${env.BRANCH_NAME}")
                  workerImage.push("latest")
              }
            }
          }
      }
  }

  post{
    always{
        echo 'Building multibranch pipeline for worker is completed..'
    }
  }
}