Creates a playbook task

curl --request POST \
  --url https://api.rootly.com/v1/playbooks/{playbook_id}/playbook_tasks \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "playbook_tasks",
    "attributes": {
      "task": "<string>",
      "description": "<string>",
      "position": 123
    }
  }
}'

{
  "data": {
    "id": "63c8479e-52cc-4c98-b53b-44579ae734f5",
    "type": "playbook_tasks",
    "attributes": {
      "playbook_id": "8bb4d4c3-5159-4463-a7d9-8fade451a345",
      "task": "New task",
      "description": "New task description",
      "position": 1,
      "created_at": "2025-11-06T13:28:19.966-08:00",
      "updated_at": "2025-11-06T13:28:19.966-08:00"
    }
  }
}