README: note on channels

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Domen Kožar 2020-09-21 14:37:56 +02:00
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Installs [Nix](https://nixos.org/nix/) on GitHub Actions for the supported platforms: Linux and macOS.
By default it has no channels configured, you have to set `nix_path`
by [picking a channel](https://status.nixos.org/)
or [pin nixpkgs yourself](https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs.html).
# Features
- Quick installation (~4s on Linux, ~20s on macOS)