Jenkins Start new node/agent container and send emails

groovy.groovy

def label = "mypod-${UUID.randomUUID().toString()}"

podTemplate(label: label, cloud: 'myKubernetesCluster',
    containers:[
    containerTemplate(name: 'jnlp',
    alwaysPullImage: true,
    resourceRequestMemory: '4Gi', 
    resourceLimitMemory: '4Gi', 
    resourceRequestCpu: '1000m', resourceLimitCpu: '1000m', 
        workingDir: '/home/jenkins/workspace', 
        envVars: [envVar(key:'JENKINS_ENV', value:'DEV')],
        command: '/home/jenkins/jenkins-slave', 
        image: 'myBeatyJenkinsAgentImage:1', 
        ttyEnabled: true)
    ]
    )
    {

        node(label) {
            stage('rebooting') {
                def rc = sh(
                        script: 'echo "empanada"',
                        returnStdout : true
                ).trim()
                echo "es una ${rc}"
                emailext body: "${currentBuild.currentResult}: Job ${env.JOB_NAME} build ${env.BUILD_NUMBER}\n More info at: ${env.BUILD_URL}",
                    recipientProviders: [[$class: 'DevelopersRecipientProvider'], 
                    [$class: 'RequesterRecipientProvider']],
                    subject: "Container Build ${currentBuild.currentResult}: ${rc} Job ${env.JOB_NAME}",
                    to: "you@myfriend.com"
            }
        }
    }