nix: add shell.nix file

[Cloudef]

Provides way to get InvokeAI environment through nix [1]
This merely wraps miniconda into a own shell environment, and does not try to reproduce the build itself.
Tested on both linux-x86_64 and aarch64-darwin

1: https://nixos.org/

[colemickens]

Oh hey there @Cloudef. I'm sorta only willing to put time into this at rare moments, but I have a flake that actually can run invoke-ai already :D

If you wanted to help me get the last bits packaged, I'd love to be able to point to an ACTUALLY EASY TO RUN stable-diffusion fork.

[colemickens]

I guess linking to it would help: https://github.com/colemickens/stable-diffusion-flake

EDIT: to make things easy to grok, I use a fork of nixpkgs with some extra python derivations for the AI/ML space: https://github.com/colemickens/nixpkgs/tree/stable-diff these should all be relatively upstreamable though...

[colemickens]

(note that the flake's shell still uses pip for the last few packages, but it beats the pants off using miniconda imo)

[Cloudef]

@colemickens hey that actually looks really neat. By the way have you considered trying out https://github.com/DavHau/mach-nix ?

[colemickens]

whoa, no, I hadn't even come across that. It looks neat, seems like there's more and more efforts like this popping up for various languages.

(Sidenote, just opportunistically, @Cloudef, NixCon is going on this week in Paris and there's a hackathon on Saturday. If you want to collaborate on this, I think it'd be fun and I think our TZs overlap a bit. There's lots of discussion here about how to "market" Nix, and goodness, this feels like a good opportunity. I'm on matrix as @colemickens:matrix.org if you want to ping me and find/make a room to collab.)

[colemickens]

Here, it's busted right now but I'm going to be working on it here:
https://github.com/colemickens/InvokeAI/tree/flake

1. Need to package a couple more python bits.
2. InvokeAI really needs to support loading the model file from outside the repo or something.

[colemickens]

So, I have a version that works with nix run! It's still hacky, but I'm pretty darn pleased already.

[lstein]

This is great. My only request is that you change the PR to rebase it against development. Thanks.

[Cloudef]

Done

[lstein]

LGTM