Retrieves an override shift

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

{
  "data": {
    "id": "a86dc777-9e2f-4b79-b07b-af53e8285b57",
    "type": "shifts",
    "attributes": {
      "schedule_id": "828ae84d-9ff4-4beb-9db2-2baa8082f439",
      "rotation_id": "d2d6290b-3b27-4afd-9caa-0da32a93dbae",
      "user_id": 455,
      "starts_at": "2025-12-21T06:10:08.000-08:00",
      "ends_at": "2025-12-21T14:10:08.000-08:00",
      "is_override": true
    },
    "relationships": {
      "shift_override": {
        "data": null
      },
      "user": {
        "data": {
          "id": "455",
          "type": "users"
        }
      }
    }
  }
}