cloudbuild.yaml

steps:
# Build the image
- id: 'Build docker image'
  name: 'gcr.io/cloud-builders/docker'
  args: [ 'build', '-t', 'gcr.io/$PROJECT_ID/$_APP_NAME:$SHORT_SHA', '.' ]

# Push updated image
- id: 'Push image to registry'
  name: 'gcr.io/cloud-builders/docker'
  args: [ 'push', 'gcr.io/$PROJECT_ID/$_APP_NAME:$SHORT_SHA' ]

# Patch the Deployment
- id: 'Patch manifest with new image'
  name: 'gcr.io/cloud-builders/kubectl'
  entrypoint: 'sh'
  env:
    - 'CLOUDSDK_COMPUTE_ZONE=${_CLOUDSDK_COMPUTE_ZONE}'
    - 'CLOUDSDK_CONTAINER_CLUSTER=${_CLOUDSDK_CONTAINER_CLUSTER}'
  args:
    - '-c'
    - |
      gcloud container clusters get-credentials \
        --project="${PROJECT_ID}" --zone="${_CLOUDSDK_COMPUTE_ZONE}" "${_CLOUDSDK_CONTAINER_CLUSTER}"

      cat <<EOF > patch.yaml
      spec:
        template:
          spec:
            containers:
              - name: ${_APP_NAME}
                image: gcr.io/${PROJECT_ID}/${_APP_NAME}:${SHORT_SHA}
      EOF

      kubectl patch --local -o yaml \
        -f k8s/deployment.yaml \
        -p "$(cat patch.yaml)" \
        > deployment.yaml

      mv deployment.yaml k8s/deployment.yaml

# Apply change
- id: 'Apply update to cluster'
  name: 'gcr.io/cloud-builders/kubectl'
  args: [ 'apply', '-f', 'k8s/']
  env:
    - 'CLOUDSDK_COMPUTE_ZONE=${_CLOUDSDK_COMPUTE_ZONE}'
    - 'CLOUDSDK_CONTAINER_CLUSTER=${_CLOUDSDK_CONTAINER_CLUSTER}'

# Associate image that was pushed to GCR with the build history UI
images:
- 'gcr.io/$PROJECT_ID/$_APP_NAME:$SHORT_SHA'