Retrieves a custom form

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

{
  "data": {
    "id": "289db2a6-e4ae-429a-ae15-ef12487f976b",
    "type": "custom_forms",
    "attributes": {
      "slug": "cum-officiis-amet-praesentium",
      "name": "Cum officiis amet praesentium.",
      "description": "Est et quidem explicabo.",
      "enabled": true,
      "command": "cum-officiis-amet-praesentium",
      "created_at": "2025-10-28T14:22:37.439-07:00",
      "updated_at": "2025-10-28T14:22:37.439-07:00"
    }
  }
}