Nixify hugo deployment

Create a derivation for building the static files of my blog.

blog/default.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.stdenv.mkDerivation {
+  name = "blog.wpcarro.dev";
+  buildInputs = with pkgs; [ hugo ];
+  src = ./.;
+  buildPhase = ''
+    mkdir -p $out
+    ${pkgs.hugo}/bin/hugo --minify --destination $out
+  '';
+  dontInstall = true;
+}

nixos/socrates/configuration.nix

@@ -154,7 +154,7 @@ in {
       "blog.wpcarro.dev" = {
         addSSL = true;
         enableACME = true;
-        root = "/var/www/blog";
+        root = briefcase.blog;
       };
     };
   };