Add network check for rubygems.org accessibility in test script

Author: sireeshajonnalagadda

test/ruby-rails-postgres/test.sh

@@ -10,11 +10,19 @@ fixTestProjectFolderPrivs
 # Run common tests
 checkCommon
 
+
 # Run devcontainer specific tests
 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 if we can reach rubygems.org before proceeding.
+# This uses curl to silently (-s) make a request to https://rubygems.org
+# Redirects output to /dev/null because we only care if the request succeeds, not the result itself.
+if ! curl -s https://rubygems.org > /dev/null; then
+  echo "Network access to rubygems.org is unavailable. Please check network or proxy settings."
+  exit 1
+fi
 check "user can install gems" gem install github-markup
 
 # Report result