Introduce nix tooling for reproducable dev envirionments

[Sntx626]

Added a nix-shell to the project.
This allows developers to ephemrally install pinned packages to easily get a working dev env.

• feat: added nix tooling

This only has an effect if developers use nix, it changes nothing about the project for anyone else.

[dezoito]

Thank you for your interest in the project.

The PR is merged, but I'll ping you to update that file in case new dependencies are added, ok? ;)

If you don't mind me asking, why did you include gnome.libsoup? Is it something you commonly use in developing Rust apps?

[Sntx626]

Great!

I'll ping you to update that file in case new dependencies are added, ok? ;)

No problem at all! Feel free to ping me if something about the nix code needs to be changed or dependencies added/removed.

If you don't mind me asking, why did you include gnome.libsoup? Is it something you commonly use in developing Rust apps?

I figured out the required depencies through trial and error.
Since you asked, I looked into it a bit more and figured out that libsoup is a depency of the project (c.f. cargo tree | grep soup). However it is also added by the webkitgtk dependency, so we can forego adding gnome.libsoup specifically.

I also noticed that I forgot to add yarn as a depency. It seems that I still was in another devshell providing yarn when creating this flake...

I'll add a follow-up PR removing gnome.libsoup and adding yarn.