code: def remove_buildkite_env():
      for key in os.environ:
          if key.startswith("BUILDKITE"):
              os.environ.pop(key)
  
imports: import os
  import sys
  import time
  import pytest
  from unittest.mock import patch
  from freezegun import freeze_time
  from ray_release.bazel import bazel_runfile
  from ray_release.exception import RayWheelsNotFoundError, RayWheelsTimeoutError
  from ray_release.util import url_exists
  from ray_release.wheels import get_ray_version, DEFAULT_REPO, get_ray_wheels_url, find_ray_wheels_url, find_and_wait_for_ray_wheels_url, is_wheels_url_matching_ray_verison, get_wheels_filename, maybe_rewrite_wheels_url, parse_commit_from_wheel_url
label_desc: Use image node_id 1 for calling a global function with example usage: remove_buildkite_env() without return types