_1password-gui: add update script

pkgs/tools/security/1password-gui/default.nix

@@ -51,6 +51,8 @@ stdenv.mkDerivation rec {
       --prefix LD_LIBRARY_PATH : "${stdenv.lib.makeLibraryPath runtimeLibs}"
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = with stdenv.lib; {
     description = "Multi-platform password manager";
     longDescription = ''

pkgs/tools/security/1password-gui/update.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl gnused common-updater-scripts
+
+version="$(curl -sL https://onepassword.s3.amazonaws.com/linux/debian/dists/edge/main/binary-amd64/Packages | sed -r -n 's/^Version: (.*)-[0-9]+/\1/p' | head -n1)"
+update-source-version _1password-gui "$version"