Please add ki to nixos package

Subj.

[NixOS](https://nixos.org/)

Currently I'm doing
```
RUN nix-env -iA nixpkgs.jdk
RUN nix-env -iA nixpkgs.gawk
RUN nix-env -iA nixpkgs.unzip
RUN nix-env -iA nixpkgs.curl

RUN curl --location -o ki-archive.zip https://github.com/Kotlin/kotlin-interactive-shell/releases/download/v0.4.5/ki-archive.zip
RUN unzip ki-archive.zip -d /root/.nix-profile/
RUN rm ki-archive.zip
RUN mv /root/.nix-profile/ki/bin/* /root/.nix-profile/bin/
RUN mv /root/.nix-profile/ki/lib/* /root/.nix-profile/lib/
RUN rm -rf /root/.nix-profile/ki/
```

No repository file or test is named. Start by investigating how the NixOS package should expose the ki-archive.zip contents and compare it with the manual nix-env, curl, unzip, and mv steps shown; done means ki can be installed as a NixOS package without those manual commands.

Written by the indexing model from the issue text.