Retrieves a custom form

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

{
  "data": {
    "id": "705a2fa0-2232-4d59-ba96-85d3bb7818b6",
    "type": "custom_forms",
    "attributes": {
      "slug": "non-eum-sed-eaque",
      "name": "Non eum sed eaque.",
      "description": "Iste quia qui amet.",
      "enabled": true,
      "command": "non-eum-sed-eaque",
      "created_at": "2025-12-22T14:53:06.735-08:00",
      "updated_at": "2025-12-22T14:53:06.735-08:00"
    }
  }
}