Jenkins:如何在脚本化管道中更改shell？

pipeline {
    agent any
    
    stages {
        stage('Build') {
            steps {
                // 更改shell为bash
                sh '''
                    #!/bin/bash
                    echo "This is a bash shell"
                '''
            }
        }
        
        stage('Test') {
            steps {
                // 更改shell为Python
                sh '''
                    #!/usr/bin/env python
                    print("This is a Python shell")
                '''
            }
        }
    }
}