main.py

import os, json

UUID = os.environ.get('KEY')

conf = json.dumps({
  "log": {
    "level": "info",
    "timestamp": True
  },
  "inbounds": [
    {
      "type": "vless",
      "tag": "vless-in",
      "listen": "::",
      "listen_port": 7860,
      "users": [
        {
          "name": "user1",
          "uuid": UUID
        }
      ],
      "transport": {
        "type": "ws",
        "path": "/ws"
      }
    }
  ],
  "outbounds": [
    {
      "type": "direct",
      "tag": "direct"
    }
  ]
})

print(conf)

with open("/etc/sing-box/config.json", "w", encoding="utf-8") as f:
    f.write(conf)

os.system("sing-box run -c /etc/sing-box/config.json")