Remove substitution shenanigans

nixos/machines/apollo/configuration.nix

@@ -17,7 +17,6 @@ in {
     ../../roles/fonts.nix
     ../../roles/boot-key.nix
     ../../roles/standalone
-    ../../roles/use-cache.nix
   ];
 
   networking = {

nixos/machines/hera/configuration.nix

@@ -22,7 +22,6 @@ in {
     ../../roles/email2matrix.nix
     ../../roles/matrix-synapse.nix
     ../../roles/coturn.nix
-    ../../roles/serve-store.nix
     ../../roles/go-neb.nix
     ./web.nix
     ./mail.nix

nixos/roles/local-nix-cache.nix

@@ -1,20 +0,0 @@
-{ config, pkgs, lib, ... }:
-let inherit (import ../../lib) sources;
-  local-nix-cache = import sources.local-nix-cache { };
-in {
-  imports = [ (local-nix-cache.path + "/module.nix") ];
-
-  local-nix-cache = {
-    server.enable = true;
-    client.enable = true;
-  };
-  networking.firewall.allowedTCPPorts = [ config.local-nix-cache.server.port ];
-
-  systemd.services.local-nix-cache.path = [ local-nix-cache.nix ];
-  systemd.services.local-nix-cache.serviceConfig.Restart = "always";
-
-  services.avahi.enable = true;
-  services.avahi.publish.enable = true;
-  services.avahi.publish.userServices = true;
-
-}

nixos/roles/serve-store.nix

@@ -1,19 +0,0 @@
-{ config, ... }: {
-  services = {
-    nix-serve = {
-      enable = true;
-      secretKeyFile = "/var/cache-priv-key.pem";
-    };
-    nginx = {
-      enable = true;
-      virtualHosts."binarycache" = {
-        listen = [{
-          addr = "[::]";
-          port = 5001;
-        }];
-        locations."/".proxyPass =
-          "http://127.0.0.1:${toString config.services.nix-serve.port}";
-      };
-    };
-  };
-}

nixos/roles/use-cache.nix

@@ -1,7 +0,0 @@
-{ lib, ... }: {
-  nix = {
-    binaryCaches = lib.mkAfter [ "http://hera:5001" ];
-    binaryCachePublicKeys =
-      [ "hera:dPBUx652Yr9s2pQDeHRQ5dl5zSuo+j94AyvJGZJaMFw=" ];
-  };
-}