update celery app conifugation

eshop_project/celery.py

@@ -2,9 +2,14 @@ import os
 from celery import Celery
 from django.conf import settings
 
-os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'eshop_project.settings.celery')
+os.environ.setdefault('DJANGO_SETTINGS_CELERY_MODULE', 'eshop_project.settings.celery')
 
 app = Celery('eshop_project')
 
-app.config_from_object('django.conf:settings')
+# Using a string here means the worker doesn't have to serialize
+# the configuration object to child processes.
+# - namespace='CELERY' means all celery-related configuration keys
+#   should have a `CELERY_` prefix.
+app.config_from_object('django.conf:settings', namespace='CELERY')
 app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
+