nix uses xdg directories

base.nix

@@ -89,6 +89,7 @@
       distributedBuilds = true;
       optimise.automatic = true;
       settings = {
+        use-xdg-base-directories = true;
         auto-optimise-store = true;
         trusted-users = [ "nixremote" ];
         system-features = featuresList;