[ruby/agoo] Use bundler to require dependencies (#10554)

This makes things more reproducible.

Author: p8

frameworks/Ruby/agoo/agoo.dockerfile

@@ -21,5 +21,4 @@ RUN bundle install --jobs=4
 
 EXPOSE 8080
 
-
 CMD AGOO_WORKER_COUNT=$(nproc) ruby app.rb

frameworks/Ruby/agoo/app.rb

@@ -1,10 +1,7 @@
 # frozen_string_literal: true
 
-require 'agoo'
-require 'connection_pool'
-require 'oj'
-require 'pg'
-require 'rack'
+require 'bundler/setup'
+Bundler.require(:default) # Load core modules
 
 $pool = ConnectionPool.new(size: 1, timeout: 5) do
   conn = PG::Connection.new({