Add garnix CI cache
diff --git a/flake.nix b/flake.nix
index ccf714a..fd128a1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,6 +37,7 @@
             modules = [
               ./default/configuration.nix
               ./default/hardware-configuration.nix
+              ./modules/cache.nix
               ./modules/caddy.nix
               ./modules/clamav.nix
               ./modules/code-server.nix