[jenkins] pipeline groovy use secret `printenv NAME`

pipeline {
    agent {
        kubernetes {
            inheritFrom 'seunggabi-batch'
            defaultContainer 'seunggabi-batch'
        }
    }

    environment {
        COUNTRY = "kr"
        ENV = "prod"
        CLASS = "seunggabi.batch.job.TestJob"
    }

    stages {
        stage('Run Job') {
            steps {
                script {
                    ARGS = sorted(params).collect { /$it.value/ } join ","
                }

                sh "/app/static/sh/emr.sh 1 20 ${COUNTRY} ${ENV} ${CLASS} \$(printenv MAIL_DOMAIN),\$(printenv MAIL_ID),\$(printenv MAIL_PW),\"${ARGS}\""
            }
        }
    }
}

@NonCPS
def sorted(def m){
    m.sort { /$it.key/ }
}

https://www.ibm.com/docs/en/zos/2.4.0?topic=descriptions-printenv-display-values-environment-variables 

printenv - Display the values of environment variables

https://e.printstacktrace.blog/jenkins-pipeline-environment-variables-the-definitive-guide/

Jenkins Pipeline Environment Variables - The Definitive Guide