[ilyagr]

I've just tried both `devenv` and `flox`, and the latter had two related niceties:

- Direnv wants to put its config inside the root of a git repo, which makes it hard to ignore. Flox's config is all in a `.flox` directory, so I could `echo * >> .flox/.gitignore` in any repo without changing the repo's gitignore.

- There seems to be no way to run `direnv` on an environment that's not the current working dir, see https://github.com/cachix/devenv/issues/67.

OTOH, `flox` was a bit harder to install in an existing nix setup and requires trusting their cache, at least if I wanted to do a cached install. You can follow the instructions in https://flox.dev/docs/install-flox/#__tabbed_1_6, or you could add yourself to Nix's "trusted users" (which makes sense only if you're the only user on the computer using Nix). See also https://github.com/flox/flox/issues/1179.