forge-mtg: add updateScript

Co-authored-by: Christopher Fredén <me@icetan.org>

pkgs/by-name/fo/forge-mtg/package.nix

@@ -10,6 +10,7 @@
   makeDesktopItem,
   copyDesktopItems,
   imagemagick,
+  nix-update-script,
 }:
 
 let
@@ -122,6 +123,10 @@ maven.buildMavenPackage {
     done
   '';
 
+  passthru.updateScript = nix-update-script {
+    extraArgs = [ "--version-regex=forge-(.*)" ];
+  };
+
   meta = with lib; {
     description = "Magic: the Gathering card game with rules enforcement";
     homepage = "https://card-forge.github.io/forge";