Get available GitHub runner scale set options

{
  "scale_sets": [
    {
      "cpu_limits": "string",
      "github_price_per_minute": 0.1,
      "id": 0,
      "image": "string",
      "memory_limits": "string",
      "name": "string",
      "price_per_minute": 0.1,
      "storage_size": "string"
    }
  ]
}