Fleek should have the ability to use system manager

[dnkmmr69420]

Is your feature request related to a problem? Please describe.
I am unable to install packages system wide but there is a way to do it with system manager

Describe the solution you'd like
Fleek should be able to install packages using this here https://github.com/numtide/system-manager

Describe alternatives you've considered
Home manager can also manage the root profile too but system manager seems better

Additional context
It will make system manager easier to use too

[bketelsen]

considering. Fleek is cross platform and this is a linux-only feature.

[dnkmmr69420]

maybe we can just have it in the linux version for now. we could use nix-darwin for macos users

[sdrush]

I'd be a big +1 for an easy-ish way to use nix-darwin. I'd love to be able to use nix-darwin's brew support to manage all my casks and Appstore applications.