buildkite/pipelines/BUILD_file_generator-postsubmit.json

{
  "platforms": {
    "ubuntu1404": {"build_targets": ["..."], "test_targets": ["..."]},
    "ubuntu1604": {"build_targets": ["..."], "test_targets": ["..."]},
    "macos": {"build_targets": ["..."], "test_targets": ["..."]}
  }
}