How can i configure a static route for a DO app?

My app currently has a single service which is runs a node app. But I also have a public folder which I’d like to expose. Since the app occasionally crashes (and takes a few seconds to get back up), this occasionally results in assets from the public folder to return a 504 error.

I noticed the “services” in the app spec yaml can be an array. Is there an easy way to add a simple http server that just makes a folder public, without having to add a github repo or anything (similar to adding the directory to nginx configs)?

Or maybe I can add it as a script on the same github project with a different run command? Would this cause it to have to download my project twice?