{self, ...}: {
  programs.ssh.extraConfig = ''
    Host builder
        Hostname data.gssws.de
        Port 2222
        User builder
        IdentitiesOnly yes
        IdentityFile /root/.ssh/id_ed25519-builder
  '';

  nix.buildMachines = [
    {
      hostName = "builder";
      systems = ["x86_64-linux" "aarch64-linux" "i686-linux"];
      maxJobs = 20;
      speedFactor = 2;
      supportedFeatures = ["nixos-test" "benchmark" "big-parallel" "kvm"];
      mandatoryFeatures = [];
    }
  ];

  nix.distributedBuilds = true;
  nix.settings = {
    trusted-public-keys = ["chonk:1b/yLBRW2ZeL9jErW1ogMRUTq/hidJnZOxopx363JSo="];
    builders-use-substitutes = true;
  };
}