feat: port-tools

Very unfinished, but it's useful as-is!

hosts/nixos-testbed/configuration.nix

@@ -73,15 +73,15 @@
   services.xserver.xkb.layout = "us";
   services.xserver.xkb.options = "caps:escape";
 
-  environment.systemPackages = with pkgs; [
-    neovim
-    git
-    git-annex
+  environment.systemPackages = [
+    pkgs.neovim
+    pkgs.git
     sydnix-cli.packages.x86_64-linux.default
+    (import ../../scripts/port-tools { inherit pkgs; })
 
     # Waypipe provides the equivalent of X11 forwarding for Wayland.  This is a
     # VM, so it's very handy.
-    waypipe
+    pkgs.waypipe
   ];
 
   services.openssh = {