Nix Flake develop broken for Mac

[peterbecich]

We need to figure out why nix develop on Mac pulls in Linux dependencies.

hackage-server/flake.nix

Lines 34 to 57 in f52a15d

	tools = hp: {
	# Setting to null should remove this tool from defaults.
	haskell-language-server = null;
	inherit (pkgs)
	cabal-install
	ghc
	# https://github.com/haskell/hackage-server/pull/1219#issuecomment-1597140858
	# glibc
	# icu67
	# zlib
	openssl
	cryptodev
	pkg-config
	brotli
	gd
	libpng
	libjpeg
	fontconfig
	freetype
	expat
	;
	};

Error in nix develop in Mac:
#1244 (comment)

           70|
           71| assert stdenv.isLinux;
             | ^
           72|

The error can also be seen in nix flake check on the Mac GitHub Action:
https://github.com/haskell/hackage-server/actions/runs/5982632728/job/16231916472

nix flake check checks nix develop: srid/haskell-flake#172 (comment)

[peterbecich]

We should also check --show-trace: srid/haskell-flake#172 (comment)

[peterbecich]

Should be fixed, @andreasabel , please try nix develop again on your Mac

[andreasabel]

Should be ok. I interrupted it though as it was downloading GBs, and I got a warning that my harddrive was running full, so I cured it with sudo rm -rf /nix/store.