old_contents: import os
  from typing import Dict
  
  from ray_release.exception import ReleaseTestConfigError
  
  DEFAULT_ENVIRONMENT = "prod"
  
  
  def load_environment(environment_name: str) -> Dict[str, str]:
      this_dir = os.path.dirname(__file__)
      env_file = os.path.join(this_dir, "environments", f"{environment_name}.env")
  
      if not os.path.exists(env_file):
          raise ReleaseTestConfigError(
              f"Unknown environment with name: {environment_name}"
          )
  
      env = {}
      with open(env_file, "r") as f:
          for line in f.readlines():
              if not line:
                  continue
              key, val = line.strip().split("=", maxsplit=1)
              env[key] = val.strip('"')
  
      return env
  
  
  def populate_os_env(env: Dict[str, str]) -> None:
      for k, v in env.items():
          os.environ[k] = v
  
new_contents: import os
  from typing import Dict
  
  from ray_release.exception import ReleaseTestConfigError
  
  DEFAULT_ENVIRONMENT = "staging"
  
  
  def load_environment(environment_name: str) -> Dict[str, str]:
      this_dir = os.path.dirname(__file__)
      env_file = os.path.join(this_dir, "environments", f"{environment_name}.env")
  
      if not os.path.exists(env_file):
          raise ReleaseTestConfigError(
              f"Unknown environment with name: {environment_name}"
          )
  
      env = {}
      with open(env_file, "r") as f:
          for line in f.readlines():
              if not line:
                  continue
              key, val = line.strip().split("=", maxsplit=1)
              env[key] = val.strip('"')
  
      return env
  
  
  def populate_os_env(env: Dict[str, str]) -> None:
      for k, v in env.items():
          os.environ[k] = v
  
subject: change the default env to staging (#30607)