fix(docker): restrict Redis port binding to local interface

docker-compose.yml

@@ -49,7 +49,8 @@ services:
     container_name: libredesk_redis
     restart: unless-stopped
     ports:
-      - "6379:6379"
+      # Only bind on the local interface.
+      - "127.0.0.1:6379:6379"
     networks:
       - libredesk
     volumes: