Add nix flake

[silky]

Thanks for this nice project! I wanted to run it via Nix, so I added a flake.

The project can now be run with:

nix run .

:)

Note that this also adds a devShell, but doesn't add any of the pre-commit hooks. I'll leave that to someone else who might be interested in actually hacking on this project.

[Tenzer]

Thank you for contributing!

I'd prefer to not have the .envrc and .gitignore changes included. I use direnv myself and have added .direnv to my local gitignore file to make sure my .envrc file and .direnv/ folder don't get added. See also https://sebastiandedeyne.com/setting-up-a-global-gitignore-file/.

As for the Flake configuration, I don't have much experience with flakes myself. What needs to be done to maintain this configuration? Does it need to be edited/regenerated if/when a new dependency is added or updated? How would I do that?

Could you add a line to README.md about how you would run/install Alga via Nix, please?

Thanks again!

[silky]

I'd prefer to not have the .envrc and .gitignore changes included

Done.

I use direnv myself and have added .direnv to my local gitignore file to make sure my .envrc file and
.direnv/ folder don't get added. See also https://sebastiandedeyne.com/setting-up-a-global-gitignore-file/.

For what it's worth, it's idiomatic these days to have a .envrc in the repo itself.

What needs to be done to maintain this configuration? Does it need to be
edited/regenerated if/when a new dependency is added or updated?

It's manually constructed.

Ideally, no changes are required as new dependencies come in; you can see it reads the deps from the pyproject.yaml file itself. However, it turns out sometimes packages are not present on nixpkgs, in which case they need to be manually added, as I've done with the cfgs package.

CI could be set up to do that, if one wished ...

Could you add a line to README.md about how you would run/install Alga via Nix, please?

Done! :)

[Tenzer]

Thank you!