jenkins的pipeline中隐藏账号密码

            steps {
                withCredentials([usernamePassword(credentialsId: 'f1ae8e1e-b082-49de-89fb-a99e514b62bb', passwordVariable: 'password', usernameVariable: 'username')]) {
                sh '''docker login -u $username -p $password registry.cn-hangzhou.aliyuncs.com
                    docker tag jenkins-demo registry.cn-hangzhou.aliyuncs.com/conlon/jenkins-demo-repository:latest
                    docker push registry.cn-hangzhou.aliyuncs.com/conlon/jenkins-demo-repository:latest'''
                }
            }