Add nix-serve to server

flake.nix

@@ -161,6 +161,7 @@
         systemConfig {
           inherit hostName user system;
           systemModules = [
+            ./services/nix-serve.nix
             ./services/caddy.nix
             ./services/gitea.nix
             ./services/grafana.nix

services/nix-serve.nix

@@ -0,0 +1,8 @@
+{config, ...}: {
+  imports = [./caddy.nix];
+  services.nix-serve = {
+    enable = true;
+    openFirewall = true;
+  };
+  services.caddy.virtualHosts."nix.xenia.me.uk".extraConfig = "reverse_proxy http://localhost:${config.services.nix-serve.port}";
+}