Replace haskell.nix with stacklock2nix #675
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Haskell.nix may not have ghc cached (of course, it may be cached.) When it is not cached, compiling ghc will run 2-3 times. It's a waste of maintenance time because every stackage upgrade has something like that.
This PR uses stacklock2nix to reduce that time, because stacklock2nix uses nixpkgs' cached ghc.
Before trying stacklock2nix, I tried using nixpkgs ghc in haskell.nix, but it didn't work.
This is the first time to support apple silicon. I tested this on apple silicon.