Configure nix-shell to use zsh and allow unfree packages in home-manager

home/default.nix

@@ -43,6 +43,7 @@
     TERM = "tmux-256color";
     LESSHISTFILE = "${config.xdg.cacheHome}/less/lesshst";
     MANPATH = "$MANPATH:/usr/local/man";
+    NIX_BUILD_SHELL = "zsh";
   };
   home.sessionPath = [
     "${config.home.homeDirectory}/.local/scripts"
@@ -65,6 +66,9 @@
     enableSshSupport = true;
   };
 
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+
   # Home Manager should manage itself
   programs.home-manager.enable = true;