Install haskell-language-server binaries

Doesn’t haskell.packages.ghc865.haskell-language-server work? If not, try https://github.com/shajra/nix-hls.

As for your specific question: do it in the install phase, e.g

  phases = [ "installPhase"];
  installPhase = ''
    mkdir -p $out/bin
    gzip -d < $src > $out/bin/haskell-language-server-macOS-8.6.5
    chmod +x $out/bin/haskell-language-server-macOS-8.6.5
  '';
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