docs: def _sitesettings_files():
      """
      Get a list of sitesettings files
      
      settings.py can be prefixed with a subdomain and underscore so with example.com site:
      sitesettings/settings.py would be the example.com settings file and
      sitesettings/admin_settings.py would be the admin.example.com settings file
      """
      settings_files = []
      sitesettings_path = os.path.join(env.project_package_name,'sitesettings')
      if os.path.exists(sitesettings_path):
          sitesettings = os.listdir(sitesettings_path)
          for file in sitesettings:
              if file == 'settings.py':
                  settings_files.append(file)
              elif len(file)>12 and file[-12:]=='_settings.py': #prefixed settings
                  settings_files.append(file)
      return settings_files