`devenv shell --from flake-url`

It would be nice to be able to reuse free-standing devenv shells like nix shell can do. I sometimes need my kubernetes toolset that's not associated to any specific project, so I'd like to be able to do `devenv shell -f ~/k8s` and immediately have that available.

But I'm not sure how storage would work for remote flakes, like  `devenv shell -f github:cachix/something`