How to run multiple stages on the same node with declarative Jenkins pipeline?

Question

Goal
Run multiple stages of a declarative Jenkins pipeline on the same node.

Setup
This is just a minimal example to show the p

Answer 1

Since version 1.3 of Declarative Pipeline plugin, this is officially supported. It's officially called "Sequential Stages".

pipeline {
    agent none

    stages {
        stage("check code style") {
            agent {
                docker "code-style-check-image"
            }
            steps {
                sh "./check-code-style.sh"
            }
        }

        stage("build and test the project") {
            agent {
                docker "build-tools-image"
            }
            stages {
               stage("build") {
                   steps {
                       sh "./build.sh"
                   }
               }
               stage("test") {
                   steps {
                       sh "./test.sh"
                   }
               }
            }
        }
    }
}

Official announcement here: https://jenkins.io/blog/2018/07/02/whats-new-declarative-piepline-13x-sequential-stages/