So that’s what you mean. Yes. As you have witnessed, that will be hard to create, maintain, and support. You would likely need someone working close full time to keep it up to date. There are so many pieces that you would need to track, from an intricate nginx configuration (which might actually not be one of the hard parts) to the image processing pieces and those are just the obvious pieces.
The bitnami docker image does that, though, and uses a different rails web engine, so it’s possible, but, as with bitnami, you’ll be on your own to support it.
Why do you think this is a good idea? Do you think that you could do that and reduce the system requirements in some tangible way?