Add building and linking Agda as build step

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

lib.nix

@@ -5,9 +5,18 @@ with lib;
 
 let
   protocol = ssl: if ssl then "https://" else "http://";
+  gems = bundlerEnv {
+    inherit ruby;
+
+    name = "blog-static-flake";
+    gemfile = "${blog-source}/Gemfile";
+    lockfile = "${blog-source}/Gemfile.lock";
+    gemset = ./gemset.nix;
+  };
+
   website = settings: stdenv.mkDerivation {
     inherit (settings) src ssl host;
-    inherit resume;
+    inherit resume gems ruby;
     name = "blog-static";
     version = settings.src.rev or "dirty";
     publicPath = settings.path;
@@ -18,7 +27,7 @@ let
     builder = ./build/builder.sh;
     webFiles = web-files;
     buildInputs = [
-      hugo ruby stork katex-html
+      hugo ruby stork katex-html (agda.withPackages [ agdaPackages.standard-library ])
     ];
   };
 in