Avoid duplicating "volumes" key

docker-compose.test.yml

@@ -3,12 +3,11 @@ version: "3.7"
 services:
     db:
         image: postgres:12.1
-        volumes:
-            - pgdata:/var/lib/postgresql/data
         env_file:
             - environment
         volumes:
             - ./freesound-data/db_dev_dump:/freesound-data/db_dev_dump
+            - pgdata:/var/lib/postgresql/data
         ports:
             - "5432:5432"
         environment: