fix(docker): correct environment variables in rootless setup

rootless-compose.example.yml

@@ -35,6 +35,7 @@ services:
     environment:
       HOSTNAME: 0.0.0.0
       PORT: 3000
+      GODOXY_API_ADDR: app:8888
     labels:
       proxy.aliases: ${GODOXY_FRONTEND_ALIASES:-godoxy}
       proxy.#1.port: 3000
@@ -56,6 +57,7 @@ services:
       - NET_BIND_SERVICE
     environment:
       - DOCKER_HOST=tcp://${SOCKET_PROXY_LISTEN_ADDR:-127.0.0.1:2375}
+      - GODOXY_API_ADDR=0.0.0.0:8888
     ports:
       - 80:80
       - 443:443/tcp