Jenkinsfile for building docker images

Jenkinsfile

def OUR_DOCKER = "docker.example.com"
// Requires leading slash, no trailing slash
def PROJECT_URL = "/logging/logstash"

def pod_label = "buildpod-${env.JOB_NAME.reverse().take(35).reverse()}-${env.BUILD_NUMBER}".replace('_', '-').replace('/', '-')

podTemplate(
   label: pod_label,
     containers: [
       containerTemplate(name: 'docker-builder', image: "${OUR_DOCKER}/helpers/docker-builder", ttyEnabled: true, command: 'cat')
    ],
    volumes: [
      hostPathVolume(hostPath: '/var/run/docker.sock', mountPath: '/var/run/docker.sock')
    ],
    imagePullSecrets: [ 'your_docker_pull_secret' ],
) {

  node(pod_label) {
    checkout scm
    container('docker-builder') {
      def push_label = sh(returnStdout: true, script: "git describe --abbrev=8 --long").trim()

      stage('Build & Publish') {
        docker.withRegistry("https://${OUR_DOCKER}","your_docker_push_secret") {
          // Can't use docker-pipeline commands under Kube until JENKINS-46447 is fixed
          // new_image.push()
          sh "docker build --network=host -t '${OUR_DOCKER}${PROJECT_URL}:${push_label}' -f Dockerfile . "
          sh "docker push '${OUR_DOCKER}${PROJECT_URL}:${push_label}' "
        }
      }
    }
  }
}