I would definitely not do it that way in a more serious project. But for side projects that don't have a ton of traffic I found it's perfectly fine (and faster)

I would definitely not do it that way in a more serious project. But for side projects that don't have a ton of traffic I found it's perfectly fine (and faster) to just build the container on the prod server. The website for which I'm using this method is doing a multi-stage docker build compiling SQLite in the first stage. Everything is working perfect so far.