code: def get_token_from_env():
      
      token = os.getenv('VAULT_TOKEN')
      if not token:
          token_file_path = os.path.expanduser('~/.vault-token')
          if os.path.exists(token_file_path):
              with open(token_file_path, 'r') as f_in:
                  token = f_in.read().strip()
  
      if not token:
          return None
  
      return token
docs: Get the token from env var, VAULT_TOKEN. If not set, attempt to get the token from, ~/.vault-token
  
      :return: The vault token if set, else None
      :rtype: str | None