build(docker): change the broker URL environment variable in the appl…

…ication

docker/django/entrypoint.sh

@@ -12,7 +12,7 @@ export DATABASE_URL="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES
 
 : "${RABBITMQ_HOST:=rabbitmq}"
 : "${RABBITMQ_PORT:=5672}"
-export CELERY_BROKER_URL="amqp://${RABBITMQ_USER}:${RABBITMQ_PASSWORD}@${RABBITMQ_HOST}:${RABBITMQ_PORT}/${RABBITMQ_VHOST}"
+export CLOUDAMQP_URL="amqp://${RABBITMQ_USER}:${RABBITMQ_PASSWORD}@${RABBITMQ_HOST}:${RABBITMQ_PORT}/${RABBITMQ_VHOST}"
 
 # We need this line to make sure that this container is started after the one
 # with PostgreSQL:

server/celery.py

@@ -3,9 +3,14 @@
 from celery import Celery
 from celery.app.task import Task
 
+from server.settings import env
+
 environ.setdefault("DJANGO_SETTINGS_MODULE", "server.settings.development")
 
-app = Celery("virtualjudge", broker_connection_retry_on_startup=False)
+broker = env("CLOUDAMQP_URL", default="")
+app = Celery(
+    "virtualjudge", broker=broker, broker_connection_retry_on_startup=False
+)
 
 app.config_from_object("django.conf:settings", namespace="CELERY")
 app.autodiscover_tasks()