fix docker compose test

docker-compose.test.yml

@@ -59,8 +59,7 @@ services:
 
   beat:
     restart: always
-    build:
+    image: ${IMAGE_NAME}:${CI_COMMIT_SHORT_SHA}
-      context: .
     entrypoint: [ "celery", "-A", "postamates.celery:app", "beat" ]
     
   worker:
@@ -68,8 +67,7 @@ services:
     environment:
         <<: *postgres-variables
         <<: *django-variables
-    build:
+    image: ${IMAGE_NAME}:${CI_COMMIT_SHORT_SHA}
-      context: .
     entrypoint: [ "celery", "-A", "postamates.celery:app", "worker" ]
     depends_on:
       - db