curl --request GET \
  --url http://localhost:3000/v1/admin/staff

{
  "staff": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email": "<string>",
      "first_name": "<string>",
      "last_name": "<string>",
      "deputy_employee_id": 123,
      "is_active": true,
      "operational_units": [
        "<string>"
      ],
      "role_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "role": "<string>",
      "role_description": "<string>"
    }
  ]
}