[RubyOnRails] How do I configure nixpacks.toml for caching and faster deploy

ProjectId: 02153a9e-0961-4df0-973f-a3d3ded857f4

On every deploy I'm having
- ruby compiled
- bundle installed
- assets precompiled

Even when nothing changes on these. Is there a way to cache this and make deploys faster?

What does "setting the Backend directory as root" mean?

i'm still having this issue

Sorry for such a long wait. I'm not the Ruby person around here, but it looks like it's being worked on: https://github.com/railwayapp/nixpacks/pull/817