Set prod environment

web/server.rb

@@ -13,6 +13,8 @@ class VLVSearch < Sinatra::Base
       expire_after: 14_400,
       secret: ENV['SESSION_SECRET']
 
+  set :environment ENV['APP_ENV'] == 'production' ? :production : :development
+
   get '/' do
     redirect '/login' unless signed_in?
     params[:type] = 'threads'