Set BUNDLE_PATH

Author: toshimaru

Rakefile

@@ -63,6 +63,7 @@ def generate_rails_rdoc
   cd 'rails' do
     Bundler.with_unbundled_env do
       ENV['BUNDLE_WITHOUT'] = %w[db view job storage cable ujs test rubocop lint mdl].join(':')
+      ENV['BUNDLE_PATH'] = 'vendor/bundle'
 
       # Replace sdoc gem with my forked one
       gemfile = File.read('Gemfile')