Creates an incident action item

curl --request POST \
  --url https://api.rootly.com/v1/incidents/{incident_id}/action_items \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "incident_action_items",
    "attributes": {
      "summary": "<string>",
      "description": "<string>",
      "kind": "task",
      "assigned_to_user_id": 123,
      "assigned_to_group_ids": [
        "<string>"
      ],
      "priority": "high",
      "status": "open",
      "due_date": "<string>",
      "jira_issue_id": "<string>",
      "jira_issue_key": "<string>",
      "jira_issue_url": "<string>"
    }
  }
}'

{
  "data": {
    "id": "646ddad5-4044-470e-9ce4-3daee956ecd9",
    "type": "incident_action_items",
    "attributes": {
      "incident_id": "257ba8ee-db8e-4f23-a82d-88f82ea203fb",
      "incident_title": "Cum doloribus incidunt modi.",
      "description": "New action item description",
      "assigned_to": {
        "id": 188,
        "ability_cache": {
          "team_ids": [
            169
          ],
          "administrating_team_ids": []
        },
        "accept_marketing": true,
        "accept_terms": true,
        "created_at": "2025-09-17T17:47:25.928-07:00",
        "created_through_sso": false,
        "current_team_id": 169,
        "deleted_at": null,
        "email": "jimmy_schiller@effertz.example",
        "external_id": null,
        "first_name": "Houston",
        "has_impersonate_write_permission": false,
        "how_did_you_hear_about_us": null,
        "incidents_backfilled_count": 0,
        "incidents_count": 0,
        "incidents_example_count": 0,
        "incidents_normal_count": 0,
        "incidents_scheduled_count": 0,
        "incidents_test_count": 0,
        "is_super_admin": false,
        "jti": "0769b34c-4000-44e8-b1a6-935f0ef33664",
        "last_name": "Mosciski",
        "last_notification_email_sent_at": null,
        "last_seen_at": null,
        "locale": "en",
        "onboarding_completed": true,
        "opsgenie_id": null,
        "pagerduty_id": null,
        "profile_photo_id": null,
        "push_notification_new_alert_sound": "default",
        "push_notification_new_alert_volume": 1,
        "push_notification_shift_ends_sound": "soft_bloob",
        "push_notification_shift_starts_sound": "soft_bloob",
        "scim_uid": null,
        "service_user": false,
        "session_token": null,
        "skip_tutorial": false,
        "teams_count": 1,
        "theme": "light_v2",
        "time_zone": "UTC",
        "updated_at": "2025-09-17T17:47:29.094-07:00",
        "victor_ops_id": null,
        "view_multiple_schedules": true
      },
      "assigned_to_group_ids": [
        "f5d68986-74d0-4d2e-8a5f-4e06806db29d",
        "d07bda57-200d-480b-ac52-3706934bf735"
      ],
      "kind": "task",
      "priority": "medium",
      "status": "open",
      "due_date": null,
      "jira_issue_id": null,
      "jira_issue_key": null,
      "jira_issue_url": null,
      "asana_task_id": null,
      "asana_task_url": null,
      "github_issue_id": null,
      "github_issue_url": null,
      "gitlab_issue_id": null,
      "gitlab_issue_url": null,
      "shortcut_story_id": null,
      "shortcut_story_url": null,
      "shortcut_task_id": null,
      "shortcut_task_url": null,
      "trello_card_id": null,
      "trello_card_url": null,
      "linear_issue_id": null,
      "linear_issue_url": null,
      "zendesk_ticket_id": null,
      "zendesk_ticket_url": null,
      "motion_task_id": null,
      "motion_task_url": null,
      "clickup_task_id": null,
      "clickup_task_url": null,
      "airtable_base_key": null,
      "airtable_table_name": null,
      "airtable_record_id": null,
      "airtable_record_url": null,
      "freshservice_ticket_id": null,
      "freshservice_ticket_url": null,
      "freshservice_task_id": null,
      "freshservice_task_url": null,
      "url": "https://test.rootly.com/account/incidents/cum-doloribus-incidunt-modi#nav-action-items",
      "short_url": null,
      "created_at": "2025-09-17T17:47:29.253-07:00",
      "updated_at": "2025-09-17T17:47:29.253-07:00",
      "summary": "New action item summary"
    }
  }
}