common/cloudbuild.yaml

steps:
  - name: gcr.io/cloud-builders/docker
    args:
      - build
      - '--build-arg'
      - 'BASE_IMG=gcr.io/${_PROJECT_ID}/common'
      - '-t'
      - 'gcr.io/${_PROJECT_ID}/${_IMAGE}:latest'
      - '--cache-from'
      - 'gcr.io/${_PROJECT_ID}/${_IMAGE}:latest'
      - '-f'
      - Dockerfile
      - .

  - name: gcr.io/cloud-builders/docker
    args:
      - push
      - 'gcr.io/${_PROJECT_ID}/${_IMAGE}'