Add support for ruby 4.0

Author: sireeshajonnalagadda

test/ruby-rails-postgres/test.sh

@@ -16,9 +16,9 @@ check "rails" rails --version
 check "rails installation path" gem which rails
 check "user has write permission to rvm gems" [ -w /usr/local/rvm/gems ]
 check "user has write permission to rvm gems default" [ -w /usr/local/rvm/gems/default ]
+check "gem command works" gem --version
+check "user can install gems" gem list | grep -q "bundler" 
 
-# This section verifies that gem installation works by using a built-in gem
-check "user can install gems" gem install --no-document bundler
 
 # Report result
 reportResults