{...}: {
  programs.ssh.extraConfig = ''
    Host eu.nixbuild.net
      PubkeyAcceptedKeyTypes ssh-ed25519
      IdentityFile /etc/nixos/keys/nixbuild.key
  '';

  programs.ssh.knownHosts = {
    nixbuild = {
      hostNames = ["eu.nixbuild.net"];
      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPIQCZc54poJ8vqawd8TraNryQeJnvH1eLpIDgbiqymM";
    };
  };

  # nix = {
  #   distributedBuilds = true;
  #   buildMachines = [
  #     {
  #       hostName = "eu.nixbuild.net";
  #       system = "x86_64-linux";
  #       maxJobs = 100;
  #       supportedFeatures = ["benchmark" "big-parallel"];
  #     }
  #   ];
  # };
}