nix: create site build target

default.nix

@@ -1 +1,22 @@
-(import ./release.nix { }).project
+{ nixpkgs ? import <nixpkgs> { }, compiler ? "default" }:
+let
+  inherit (nixpkgs) pkgs;
+  haskellPackages = if compiler == "default" then
+    pkgs.haskellPackages
+  else
+    pkgs.haskell.packages.${compiler};
+  jfdic-org = haskellPackages.callPackage ./jfdic-org.nix { };
+in nixpkgs.stdenv.mkDerivation {
+  name = "jfdic-org-website";
+  buildInputs = [ jfdic-org ];
+  src = ./.;
+  buildPhase = ''
+    echo "Setting LC_ALL to C.UTF-8 to avoid invalid byte sequence."
+    export LC_ALL=C.UTF-8
+    site build
+  '';
+  installPhase = ''
+    mkdir $out
+    cp -R _site/* $out
+  '';
+}