Update files

flake.nix

@@ -4,6 +4,7 @@
     inputs = {
         nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
         nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+        nix-gaming.url = "github:fufexan/nix-gaming";
         disko.url = "github:nix-community/disko/latest";
         impermanence.url = "github:nix-community/impermanence";
         home-manager = {
@@ -41,6 +42,7 @@
         self,
         nixpkgs,
         nixpkgs-unstable,
+        nix-gaming,
         impermanence,
         disko,
         home-manager,
@@ -56,6 +58,7 @@
             inherit system;
             config.allowUnfree = true;
         };
+        nix-gaming = inputs.nix-gaming.packages.${system};
         pkgs-unstable = import nixpkgs-unstable {
             inherit system;
             config.allowUnfree = true;
@@ -89,6 +92,7 @@
                 inherit impermanence;
                 inherit disko;
                 inherit hostname;
+                inherit nix-gaming;
             };
         };
     in {
@@ -124,6 +128,8 @@
                 "walker.cachix.org-1:fG8q+uAaMqhsMxWjwvk0IMb4mFPFLqHjuvfwQxE4oJM="
                 "walker-git.cachix.org-1:vmC0ocfPWh0S/vRAQGtChuiZBTAe4wiKDeyyXM0/7pM="
             ];
+            substituters = ["https://nix-gaming.cachix.org"];
+            trusted-public-keys = ["nix-gaming.cachix.org-1:nbjlureqMbRAxR1gJ/f3hxemL9svXaZF/Ees8vCUUs4="];
         };
     };
 }