Retrieves a custom form

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

{
  "data": {
    "id": "3078a130-9ad4-43f3-b5e0-98dbc8c25ad6",
    "type": "custom_forms",
    "attributes": {
      "slug": "aut-eum-id-at",
      "name": "Aut eum id at.",
      "description": "Nam qui qui et.",
      "enabled": true,
      "command": "aut-eum-id-at",
      "created_at": "2026-02-21T14:29:53.267-08:00",
      "updated_at": "2026-02-21T14:29:53.267-08:00"
    }
  }
}