struct UsersService {
    config: &'static Config,
}

struct OrdersService {
    config: &'static Config,
}

// ...

fn load() -> Result<&'static Config, Error> {
    // ...
    return Ok(Box::leak(Box::new(config)));
}

// ...

let config = config::load()?;

let users_service = UsersService::new(config);

let orders_service = OrdersService::new(config);