{ ... }:

{
  services.hydra = {
    enable = true;
    listenHost = "localhost";
    port = 3000;
    hydraURL = "https://hydra.hamburg.ccc.de/";
    # E-Mail configuration requires some work/investigation still.
    notificationSender = "no-reply@hydra.hamburg.ccc.de";
    useSubstitutes = true;
    minimumDiskFree = 8;
    minimumDiskFreeEvaluator = 2;
  };
}