fix nixpkgs rev for t2pkgs

hosts/modules/core/t2-firmware/default.nix

@@ -0,0 +1,57 @@
+# REF: https://github.com/t2linux/nixos-t2-iso
+{
+  inputs,
+  pkgs,
+  t2pkgs,
+  ...
+} @ args: {
+  imports = [
+    (import inputs.nixos-hardware.nixosModules.apple-t2 (args // {pkgs = t2pkgs;}))
+  ];
+
+  nix.settings = {
+    trusted-substituters = [
+      "https://t2linux.cachix.org"
+    ];
+    trusted-public-keys = [
+      "t2linux.cachix.org-1:P733c5Gt1qTcxsm+Bae0renWnT8OLs0u9+yfaK2Bejw="
+    ];
+  };
+
+  # cerulean channels configuration
+  nixpkgs.channels.t2pkgs = {
+    source = inputs.nixpkgs-t2-firmware;
+    config = {
+      allowUnfree = true;
+      allowBroken = false;
+    };
+    overlays = [
+      (self: super: {
+        get-apple-firmware = super.callPackage ./get-apple-firmware.nix {};
+      })
+    ];
+  };
+
+  # environment.systemPackages = with base; [
+  #   python3
+  #   dmg2img
+  #   get-apple-firmware
+  # ];
+
+  # hardware = {
+  #   apple.touchBar.enable = true;
+
+  #   # REF: https://github.com/NixOS/nixos-hardware/blob/master/apple/t2/default.nix
+  #   apple-t2 = {
+  #     # the macbook does not have an AMD dGPU (iGPU)
+  #     enableIGPU = false;
+
+  #     kernelChannel = "stable";
+
+  #     firmware = {
+  #       enable = true;
+  #       version = "sonoma";
+  #     };
+  #   };
+  # };
+}