grimm-nixos-laptop/modules/nix_cache.nix

{
  lib,
  config,
  inputs,
  pkgs,
  ...
}:
let
  inherit (config.serverConfig) ports vhosts;
in
{
  services.harmonia = {
    enable = true;
    signKeyPath = "/var/cache-priv-key.pem";
    settings.bind = "[::]:${builtins.toString vhosts.nix_cache_host.port}";
  };
}