README: clarify what the action will do

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Domen Kožar 2020-06-29 10:42:20 +02:00 committed by GitHub
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Build software only once using [Nix](https://nixos.org/nix/) with the help of [Cachix](https://cachix.org). Build software only once using [Nix](https://nixos.org/nix/) with the help of [Cachix](https://cachix.org).
This action will configure Cachix and invoke `nix-build`. This action will configure Cachix:
- all further Nix invocations will use specified binary cache
- at the end of the job, all newly built store paths will be pushed to Cachix
## Why do I need this ## Why do I need this