Use nix-env in ci #81
                
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Somehow I didn't think to use nix-env in CI until reading a snippet of someone doing so in a hackernew or mabye lobste.rs comment. This makes it so much nicer to use imo. I also got rid of the nix-shell in the formatters.sh shebang to make it more useful for users, no need to tie it to nix-shell and make it hard/unusable to people when CI will catch any diffs due to different tool versions.