{
  "type": "select",
  "key": "server_allow_custom_docker_image",
  "constant": "SERVER_ALLOW_CUSTOM_DOCKER_IMAGE",
  "description": "Allow users to enter a custom Docker image on the startup page. When disabled, users may only select images configured on the spell.",
  "required": true,
  "placeholder": "false",
  "validation": "required|string|max:255",
  "options": [
    "true",
    "false"
  ],
  "category": "servers",
  "sensitive": false
}