docker: default web mirror runtime env vars

Author: Super-Badmen-Viper

NSMusicS-Electron/docker-entrypoint.sh

@@ -1,10 +1,13 @@
 #!/bin/sh
 
+: "${NGINX_PORT:=80}"
+: "${BACKEND_SERVICE:=127.0.0.1:3321}"
+
 # 替换 Nginx 配置模板中的变量
 envsubst '${NGINX_PORT} ${BACKEND_SERVICE}' < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf
 
 # 验证配置
 nginx -t || exit 1
 
 # 执行原始命令
-exec "$@"
+exec "$@"