petites corrections

docker-compose.yml

 version: '3'
 services:
   lufidb:
-    image: postgres:12
+    image: postgres:10
     container_name: lufidb
     restart: always
-    env_file: lufi.secrets
+    env_file:
+      - lufi.env
     volumes:
       - /var/lib/postgresql/data
   lufi:
@@ -14,6 +15,8 @@ services:
       - lufidb
     ports:
       - 8081:8081
+    links:
+      - lufidb:lufidb
     volumes:
       - /lufi/data
       - /lufi/files