buildtemplate.yaml

apiVersion: build.knative.dev/v1alpha1
kind: BuildTemplate
metadata:
  name: multi-stage-build-example
spec:
  parameters:
  - name: IMAGE
    description: Where to publish the resulting image.
  steps:
  - name: test
    image: 'docker:18.09'
    args: ['build', '--target', 'test', '-t', "${IMAGE}:test", '.']
    env:
    - name: DOCKER_BUILDKIT
      value: "1"
    volumeMounts:
    - name: docker-socket
      mountPath: /var/run/docker.sock
  - name: check
    image: 'docker:18.09'
    args: ['build', '--target', 'check', '-t', "${IMAGE}:check", '.']
    env:
    - name: DOCKER_BUILDKIT
      value: "1"
    volumeMounts:
    - name: docker-socket
      mountPath: /var/run/docker.sock
  - name: build
    image: 'docker:18.09'
    args: ['build', '-t', "${IMAGE}", '.']
    env:
    - name: DOCKER_BUILDKIT
      value: "1"
    volumeMounts:
    - name: docker-socket
      mountPath: /var/run/docker.sock
  - name: structure-tests
    image: 'gcr.io/gcp-runtimes/container-structure-test'
    args: ['test', '--image', "${IMAGE}", '--config', 'structure-tests.yaml']
    env:
    - name: DOCKER_BUILDKIT
      value: "1"
    volumeMounts:
    - name: docker-socket
      mountPath: /var/run/docker.sock
  volumes:
  - name: docker-socket
    hostPath:
      path: /var/run/docker.sock
      type: Socket