docs: def get_config(variable, default=None):
      """ Get configuration variable for strudel.* packages
  
      Args:
          variable (str): name of the config variable
          default: value to use of config variable not set
  
      Returns:
          variable value
  
      Order of search:
          1. stutils.CONFIG
          2. settings.py of the current folder
          3. environment variable
  
      Known config vars so far:
          strudel.utils
          ST_FS_CACHE_DURATION - duration of filesystem cache in seconds
          ST_FS_CACHE_PATH - path to the folder to store filesystem cache
  
          strudel.ecosystems
          PYPI_SAVE_PATH - place to store downloaded PyPI packages
          PYPI_TIMEOUT - network timeout for PyPI API
  
          strudel.scraper
          GITHUB_API_TOKENS - comma separated list of GitHub tokens
          GITLAB_API_TOKENS - same for GitLab API
      """
      if variable in CONFIG:
          return CONFIG[variable]
  
      if hasattr(settings, variable):
          return getattr(settings, variable)
  
      if variable in os.environ:
          return os.environ[variable]
  
      return default