nixos-config: add live-usb

nixos-configuration/live-usb/pkg.nix

@@ -0,0 +1,29 @@
+{ config,
+  pkgs,
+  ... }:
+
+let
+
+in
+{
+  nixpkgs.config = {
+    allowBroken = false;
+    allowUnfree = true;
+
+    packageOverrides = pkgs: rec {
+
+    };
+  };
+
+  imports =
+    [
+      ../common/pkg/default.nix
+    ];
+
+  environment.systemPackages = with pkgs; [
+    firefox
+    gitFull
+    gpg2
+    nvim
+  ];
+}