spacetimedb: add nix-update-script

pkgs/by-name/sp/spacetimedb/package.nix

@@ -10,6 +10,7 @@
   librusty_v8 ? callPackage ./librusty_v8.nix {
     inherit (callPackage ./fetchers.nix { }) fetchLibrustyV8;
   },
+  nix-update-script,
 }:
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "spacetimedb";
@@ -64,6 +65,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     mv $out/bin/spacetimedb-cli $out/bin/spacetime
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Full-featured relational database system that lets you run your application logic inside the database";
     homepage = "https://github.com/clockworklabs/SpacetimeDB";