wireguard-tools: add updateScript

pkgs/tools/networking/wireguard-tools/default.nix

···
     done
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = with stdenv.lib; {
     description = "Tools for the WireGuard secure network tunnel";
     downloadPage = https://git.zx2c4.com/WireGuard/refs/;

pkgs/tools/networking/wireguard-tools/update.sh

···
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl gnused common-updater-scripts
+
+set -eu -o pipefail
+
+version="$(curl -sL https://build.wireguard.com/distros.txt | sed -n 's/^upstream\tkmodtools\t\([^\t]\+\)\t.*/\1/p')"
+update-source-version wireguard-tools "$version"