System-wide devenv.local.nix

[qaristote]

I know flakes need to be put inside a flake repository so I don't know if that would even be feasible, but it'd be nice to have a system-wide devenv.local.nix, in ~/.config/devenv for instance.
I believe the point of a devenv.local.nix file is to put configurations that are user-specific and should not be tracked. But these user-specific configurations are frequently relevant for all of the user's project: for instance, I manage my nix substituters and keys manually, so that I write cachix.enable = false in devenv.local.nix files in all my projects.
A system-wide devenv.local.nix would remove this redundancy.

Anyways, thanks for working on devenv, I find it very useful :)