Running Casdoor under Docker reverse proxied by nginx at a subpath gives 404 on static assets

I'd like to run casdoor under docker, reverse proxied by nginx at a subpath of my domain (instead of a subdomain). Works, but I get 404's on the static assets - (looking for them in /static/ instead of a relative path).
I think I need to rebuild the front end with serverUrl set to my absolute path... is that right?

digging around a bit, it looks like the only place an absolute path get used is in the index.html to load the initial sources (JS & CSS) - that's kind of annoying, would rather not recompile the whole thing to change one place

copy the build folder