Retrieves a schedule shifts

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

{
  "data": [
    {
      "id": "b299584c-6312-40d1-b987-5ceb9560dd40",
      "type": "shifts",
      "attributes": {
        "schedule_id": "5edee8f5-a938-462a-b676-bd7e0b1bdb0d",
        "rotation_id": "73af3b64-9643-48fa-aa33-256f10a3145f",
        "user_id": 905,
        "starts_at": "2026-01-23T21:00:23.000-08:00",
        "ends_at": "2026-01-24T01:00:23.000-08:00",
        "is_override": true
      },
      "relationships": {
        "shift_override": {
          "data": null
        },
        "user": {
          "data": {
            "id": "905",
            "type": "users"
          }
        }
      }
    },
    {
      "id": "44124e96-cc52-5d7f-8e7d-0c1b6168606e",
      "type": "shifts",
      "attributes": {
        "schedule_id": "5edee8f5-a938-462a-b676-bd7e0b1bdb0d",
        "rotation_id": "9662007e-2508-40c9-aa32-e6bd5c1c30be",
        "user_id": 909,
        "starts_at": "2026-01-24T02:00:23.000-08:00",
        "ends_at": "2026-01-24T06:00:23.000-08:00",
        "is_override": false
      },
      "relationships": {
        "shift_override": {
          "data": null
        },
        "user": {
          "data": {
            "id": "909",
            "type": "users"
          }
        }
      }
    }
  ]
}