Retrieves a custom form

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

{
  "data": {
    "id": "a6ab4b57-eb49-4b24-9b42-ec9d913b6114",
    "type": "custom_forms",
    "attributes": {
      "slug": "exercitationem-laborum-eos-necessitatibus",
      "name": "Exercitationem laborum eos necessitatibus.",
      "description": "Magni quia ipsam dicta.",
      "enabled": true,
      "command": "exercitationem-laborum-eos-necessitatibus",
      "created_at": "2025-09-03T02:19:35.370-07:00",
      "updated_at": "2025-09-03T02:19:35.370-07:00"
    }
  }
}