fix env file location

Author: robinpdev

docker-compose.prod.yml

@@ -11,7 +11,7 @@ services:
       - POSTGRES_PASSWORD=${SQL_PASSWORD}
       - POSTGRES_DB=${SQL_DATABASE}
     env_file:
-      - .env.prod
+      - ${ENV_LOCATION}
 
   backend:
     container_name: pigeonhole-backend
@@ -25,7 +25,7 @@ services:
     expose:
       - 8000
     env_file:
-      - .env.prod
+      - ${ENV_LOCATION}
     depends_on:
       - database
     restart: always
@@ -66,7 +66,7 @@ services:
     depends_on:
       - backend
     env_file:
-      - .env.prod
+      - ${ENV_LOCATION}
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.frontend.rule=Host(`sel2-1.ugent.be`)"