NixOS on WSL

This note is about how to install NixOS as a distribution on WSL.
This note is different from setting up Nix on WSL (which is more about how to set up Nix on any WSL Linux distro).
Link to official repo.

Installation

Make sure to run all the following commands from PowerShell. Link to official installation document.

Enable WSL if you haven’t done already:
```
wsl --install --no-distribution
```
Download nixos.wsl from the latest release.
If you have WSL version 2.4.4 or later installed (wsl --version, you can open (double-click) the .wsl file to install it. It is also possible to perform the installation from a PowerShell:
```
wsl --install --from-file nixos.wsl
```
nixos.wsl must be the path to the file you just downloaded if you’re running the command in another directory.
Run the distro:
```
wsl -d NixOS
```