curl --request GET \
  --url https://cockroachlabs.cloud/api/v1/clusters/available-regions \
  --header 'Authorization: Bearer <token>'

{
  "regions": [
    {
      "distance": 123,
      "location": "<string>",
      "name": "<string>",
      "serverless": true
    }
  ],
  "pagination": {
    "next_page": "<string>",
    "previous_page": "<string>"
  }
}

{
  "code": 123,
  "details": [
    {
      "@type": "<string>"
    }
  ],
  "message": "<string>"
}