Update authentication method

config.ru

@@ -4,4 +4,12 @@ require "hanami/boot"
 
 use Rack::Static, urls: ["/assets", "/media"], root: "public"
 
+raise StandardError.new("No secret key") unless ENV["SESSION_SECRET"]
+
+use Rack::Session::Cookie,
+    :domain => URI.parse(ENV["MICROPUB_SITE_URL"]).host,
+    :path => '/',
+    :expire_after => 3600*24,
+    :secret => ENV["SESSION_SECRET"]
+
 run Hanami.app