actually add hydra?

system/packages/bincache.nix

@@ -0,0 +1,14 @@
+
+{ config, pkgs, ... }:
+
+{
+  # Configure systems to use Hydra as a binary cache substituter
+  nix.settings = {
+    substituters = [
+      "http://rhiannon.coven.systems:3000"
+    ];
+    trusted-public-keys = [
+      "rhiannon.coven.systems:f8KiECrc7rY3vDMSy7sACyToxRLPECtQTcm6p8LFMPk="
+    ];
+  };
+}

system/yukigekko/configuration.nix

@@ -9,6 +9,7 @@
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
 
+      ../packages/bincache.nix
       #system configs
       ../defaults/system.nix
       ../defaults/locale.nix