machine_setup/nix/configuration/hosts/quark/distributed_build.nix

{
  imports = [ ];

  config = {
    me.distributed_build.enable = true;
    me.distributed_build.machines.hydra = {
      enable = true;
      additional_config = {
        speedFactor = 2;
      };
      substituter_url = "ssh-ng://nixworker@ns1.fizz.buzz:65122?compress=true&ssh-key=/persist/manual/ssh/root/keys/id_ed25519&remote-store=local?root=/.disk/root";
    };
  };
}