docs: def ready(self):
          """Called once per Django process instance.
  
          If the filesystem setup fails or if an error is found in settings.py,
          django.core.exceptions.ImproperlyConfigured is raised, causing Django not to
          launch the main GMN app.
  
          """
          # Stop the startup code from running automatically from pytest unit tests.
          # When running tests in parallel with xdist, an instance of GMN is launched
          # before thread specific settings have been applied.
          # if hasattr(sys, '_launched_by_pytest'):
          #   return
          self._assert_readable_file_if_set('CLIENT_CERT_PATH')
          self._assert_readable_file_if_set('CLIENT_CERT_PRIVATE_KEY_PATH')
          self._assert_dirs_exist('OBJECT_FORMAT_CACHE_PATH')
  
          self._assert_is_type('SCIMETA_VALIDATION_ENABLED', bool)
          self._assert_is_type('SCIMETA_VALIDATION_MAX_SIZE', int)
          self._assert_is_in('SCIMETA_VALIDATION_OVER_SIZE_ACTION', ('reject', 'accept'))
  
          self._warn_unsafe_for_prod()
          self._check_resource_map_create()
          if not d1_gmn.app.sciobj_store.is_existing_store():
              self._create_sciobj_store_root()
  
          self._add_xslt_mimetype()