Retrieves a custom form

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

{
  "data": {
    "id": "fc67a905-6ce1-4b21-824b-f0c1c242cd0c",
    "type": "custom_forms",
    "attributes": {
      "slug": "blanditiis-veniam-quasi-distinctio",
      "name": "Blanditiis veniam quasi distinctio.",
      "description": "Dolore et ut odit.",
      "enabled": true,
      "command": "blanditiis-veniam-quasi-distinctio",
      "created_at": "2025-09-18T09:16:46.069-07:00",
      "updated_at": "2025-09-18T09:16:46.069-07:00"
    }
  }
}