Add prod env to docker-compose

src/docker-compose.prod.yml

@@ -6,18 +6,17 @@ services:
       context: backend/db
     ports:
       - 27017:27017
-    environment:
-      MONGO_INITDB_ROOT_USERNAME: root
-      MONGO_INITDB_ROOT_PASSWORD: example
+    env_file: 
+      - .prod.env
 
   server:
     build:
       context: backend/server
     ports:
       - 5000:80
+    env_file: 
+      - .prod.env
     environment:
-      MONGODB__Username: root
-      MONGODB__Password: example
       MONGODB__Host: db
       MONGODB__Port: 27017
       MONGODB__Database: todo