pipeline {
    agent any 
    stages {
        stage('Hello') {
            steps {
                echo 'Hello world!' 
            }
        }
        stage('Checkout') {
            steps {
                script {
                    git credentialsId: 's444498', url: 'https://git.wmi.amu.edu.pl/s444498/ium_444498.git'
                    sh "ls -lart ./*"
                    sh "git branch -a"
                    sh "git checkout master"
                }
            }
        }
    }
}