Migrate to Determinate Nix

flake.nix

@@ -1,9 +1,16 @@
 {
   description = "System configuration for zion";
 
+  nixConfig = {
+    extra-substituters = "https://install.determinate.systems";
+    extra-trusted-public-keys = ''
+      cache.flakehub.com-3:hJuILl5sVK4iKm86JzgdXW12Y2Hwd5G07qKtHTOcDCM=
+    '';
+  };
+
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-25.11";
-    nixpkgs-unstable.url = "nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    determinate.url = "https://flakehub.com/f/DeterminateSystems/determinate/*";
     agenix = {
       url = "github:ryantm/agenix";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -32,6 +39,7 @@
           (import ./configuration.nix)
           inputs.agenix.nixosModules.age
           inputs.nixos-hardware.nixosModules.aoostar-r1-n100
+          inputs.determinate.nixosModules.default
         ];
         specialArgs = {
           inherit inputs;