lux-cli: add missing hook to install shell files (#433416)

Changed files
+5
pkgs
by-name
lu
lux-cli
+5
pkgs/by-name/lu/lux-cli/package.nix
···
cargo xtask dist-completions
'';
+
postInstall = ''
+
installManPage target/dist/lx.1
+
installShellCompletion target/dist/lx.{bash,fish} --zsh target/dist/_lx
+
'';
+
meta = {
description = "Luxurious package manager for Lua";
longDescription = ''