README: mention why install_url is useful

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Domen Kožar 2020-09-21 18:54:24 +02:00 committed by GitHub
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@ -66,7 +66,7 @@ jobs:
## Inputs (specify using `with:`)
- `install_url`: specify URL to install Nix from (useful for testing non-stable releases)
- `install_url`: specify URL to install Nix from (useful for testing non-stable releases or pinning Nix for example https://releases.nixos.org/nix/nix-2.3.7/install)
- `nix_path`: set `NIX_PATH` environment variable, for example `nixpkgs=channel:nixos-unstable`