pipeline {
    agent any
    parameters {
        choice(name: 'OS', choices: ['android', 'ios'], description: 'Pick your OS something')
    }
    environment {
        ENV     = "$OS"
    }
    stages {
        stage ('Deploy ANDROID') {
            when {
                environment name: "ENV", value: "android"
            }
            steps {
                echo 'Android execution'
            }
        }
        stage ('Deploy IOS') {
            when {
                environment name: "ENV", value: "ios"
            }
            steps {
                echo 'ios execution'
            }
        }
    }
}