If you want a similar project which 'just works' then consider using zrok. Its fully opensource which you can self-host or use the free hosted version - https://zrok.io/

Yeah, in better news though, it seems to be using gorm which has different drivers available (https://gorm.io/docs/connecting_to_the_database.html), SQLite being one of them. So unless they are doing something postgres specific, should be relatively easy to switch it out.