add z-master stage to Jenkinsfile

The z-master stage will just run the integration-cli tests. The
existing z stage will run the unit tests and the integration
tests. In this way, PR check jobs will be shorter, but all
integration tests will run after PR is merged to master.

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

Jenkinsfile

@@ -340,6 +340,7 @@ pipeline {
                                   -e DOCKER_EXPERIMENTAL \
                                   -e DOCKER_GITCOMMIT=${GIT_COMMIT} \
                                   -e DOCKER_GRAPHDRIVER \
+                                  -e TEST_SKIP_INTEGRATION_CLI=1 \
                                   -e TIMEOUT="300m" \
                                   docker:${GIT_COMMIT} \
                                   hack/make.sh \
@@ -376,6 +377,79 @@ pipeline {
                         }
                     }
                 }
+                stage('z-master') {
+                    when {
+                        beforeAgent true
+                        branch 'master'
+                        expression { params.z }
+                    }
+                    agent { label 's390x-ubuntu-1604' }
+                    // s390x machines run on Docker 18.06, and buildkit has some bugs on that version
+                    environment { DOCKER_BUILDKIT = '0' }
+
+                    stages {
+                        stage("Print info") {
+                            steps {
+                                sh 'docker version'
+                                sh 'docker info'
+                                sh '''
+                                echo "check-config.sh version: ${CHECK_CONFIG_COMMIT}"
+                                curl -fsSL -o ${WORKSPACE}/check-config.sh "https://raw.githubusercontent.com/moby/moby/${CHECK_CONFIG_COMMIT}/contrib/check-config.sh" \
+                                && bash ${WORKSPACE}/check-config.sh || true
+                                '''
+                            }
+                        }
+                        stage("Build dev image") {
+                            steps {
+                                sh '''
+                                docker build --force-rm --build-arg APT_MIRROR -t docker:${GIT_COMMIT} -f Dockerfile .
+                                '''
+                            }
+                        }
+                        stage("Integration-cli tests") {
+                            steps {
+                                sh '''
+                                docker run --rm -t --privileged \
+                                  -v "$WORKSPACE/bundles:/go/src/github.com/docker/docker/bundles" \
+                                  --name docker-pr$BUILD_NUMBER \
+                                  -e DOCKER_GITCOMMIT=${GIT_COMMIT} \
+                                  -e DOCKER_GRAPHDRIVER \
+                                  -e TEST_SKIP_INTEGRATION=1 \
+                                  -e TIMEOUT="300m" \
+                                  docker:${GIT_COMMIT} \
+                                  hack/make.sh \
+                                    dynbinary \
+                                    test-integration
+                                '''
+                            }
+                        }
+                    }
+
+                    post {
+                        always {
+                            sh '''
+                            echo "Ensuring container killed."
+                            docker rm -vf docker-pr$BUILD_NUMBER || true
+                            '''
+
+                            sh '''
+                            echo "Chowning /workspace to jenkins user"
+                            docker run --rm -v "$WORKSPACE:/workspace" busybox chown -R "$(id -u):$(id -g)" /workspace
+                            '''
+
+                            sh '''
+                            echo "Creating bundles.tar.gz"
+                            find bundles -name '*.log' | xargs tar -czf s390x-master-bundles.tar.gz
+                            '''
+
+                            archiveArtifacts artifacts: 's390x-master-bundles.tar.gz'
+                        }
+                        cleanup {
+                            sh 'make clean'
+                            deleteDir()
+                        }
+                    }
+                }
                 stage('powerpc') {
                     when {
                         beforeAgent true