Retrieves a custom form

curl --request GET \
  --url https://api.rootly.com/v1/custom_forms/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "bd6b535b-3ce2-424b-9e2b-42855940a0be",
    "type": "custom_forms",
    "attributes": {
      "slug": "dolor-quis-perspiciatis-cupiditate",
      "name": "Dolor quis perspiciatis cupiditate.",
      "description": "Occaecati dolorem cupiditate odit.",
      "enabled": true,
      "command": "dolor-quis-perspiciatis-cupiditate",
      "created_at": "2026-01-08T21:04:39.197-08:00",
      "updated_at": "2026-01-08T21:04:39.197-08:00"
    }
  }
}