cloudbuild cicd single pipeline: test, build, deploy

cloudbuild.yaml

steps:
  - id: 'tests'
    name: 'python:3.7-slim-buster'
    args: ['bash', './scripts/tests.sh']
  - id: 'build'
    name: 'gcr.io/cloud-builders/docker'
    args: ['build', '-t', '${_IMAGE_NAME}:${BRANCH_NAME}', '.']
  - id: 'push'
    name: 'gcr.io/cloud-builders/docker'
    args: ['push', '${_IMAGE_NAME}:${BRANCH_NAME}']
  - id: 'deploy'
    name: 'asia.gcr.io/my_gcp_project/helm:2.10.0'
    entrypoint: 'sh'
    args: ['./scripts/install.sh']
    env:
      - 'ENVIRONMENT=${_ENVIRONMENT}'
      - 'IMAGE_NAME=${_IMAGE_NAME}'
      - 'IMAGE_TAG=${BRANCH_NAME}'
      - 'NAMESPACE=${_NAMESPACE}'
      - 'OWNER=${_OWNER}'
      - 'REPO_NAME=${REPO_NAME}'

images: ['${_IMAGE_NAME}:${BRANCH_NAME}']
substitutions:
  _ENVIRONMENT: ''
  _IMAGE_NAME: 'asia.gcr.io/my_gcp_project/my_app'
  _NAMESPACE: 'my_namespace'
  _OWNER: 'my_email'