I've been working on something similar, but geared towards integration with VS Code. Builds on CUE + Dagger via https://github.com/hofstadter-io/hof/tree/_next/examples/env

This allows you to not only run current commands in a containerized environment, but also any point in history

> .go-version

I would not call this idiomatic Go, you can get the version my project requires from my go.mod file. Imo, a single file with the inputs your tool needs would be preferable to a bunch of files with a single line, but ideally it can infer that on it's own by looking at the language files that already exist