Add build script

flake.nix

@@ -10,6 +10,9 @@
       let pkgs = nixpkgs.legacyPackages.${system};
           weddingSiteDir = "$HOME/.local/source/wedding-site/public/";
           weddingSiteTgt = "ubuntu@chrishayward.xyz:/var/www/wedding";
+          weddingSiteBuild = pkgs.writeShellScriptBind "wedding-site-build" ''
+            pushd ${weddingSiteDir}../ && ${pkgs.hugo}/bin/hugo -v && popd
+          '';
           weddingSiteUpdate = pkgs.writeShellScriptBin "wedding-site-update" ''
             ${pkgs.rsync}/bin/rsync -aP ${weddingSiteDir} ${weddingSiteTgt}
           '';