Create a Go binary with GCB.

cloudbuild.yaml

steps:
# Install dependencies.
- name: 'gcr.io/cloud-builders/go'
  args: ['install', '.']
  env: ['PROJECT_ROOT=hello']
# Run tests.
- name: 'gcr.io/cloud-builders/go'
  args: ['test', 'hello']
  env: ['PROJECT_ROOT=hello']
# Create binary.
- name: 'gcr.io/cloud-builders/go'
  args: ['build', 'hello']
  env: ['PROJECT_ROOT=hello']
# Run binary.
# - name: 'ubuntu'
#   entrypoint: 'bash'
#   args: ['-c', './hello']
# Copy binary to GCS.
- name: 'gcr.io/cloud-builders/gsutil'
  args: ['-m', 'cp', 'hello', 'gs://my-bucket/']