[feature] direnv integration

[rawkode]

Is your feature request related to a problem? Please describe.

I'd like to request a new system: direnv.

I'm using direnv with nix flakes to provide the tooling for each of my projects. I'd like the moon tasks to run within this environment, which means loading / executing direnv.

Describe the solution you'd like

Setting "system: direnv" in at the top of my monorepo and all projects inheriting it.

[milesj]

I don't use direnv, so I'm not sure how it works, but is it just powered by your shell? You probably just want to enable shell: true for your tasks.