fix: media cdn mount

Signed-off-by: Ameya Shenoy <shenoy.ameya@gmail.com>

docker-compose.prod.yml

@@ -16,6 +16,8 @@ services:
       context: ./backend
       dockerfile: Dockerfile
     restart: unless-stopped
+    volumes:
+      - ./backend/media_cdn:/code/media_cdn
     env_file:
       - prod.env
     depends_on: