[.devcontainer] make it work under ancient rubies

Notice that it now removes locks, a cleaner solution
would be to go multi-lock - and I tried - and then
gave up due to time constraints.

Something to revisit in the future.

Author: solnic

.devcontainer/setup

@@ -35,6 +35,7 @@ class SetupScript
 
     if should_run_bundle?
       cleanup_ruby_lsp_directories
+      update_rubygems_and_bundler
       install_bundle_dependencies
       install_foreman_gem if @options[:with_foreman]
     end
@@ -121,7 +122,8 @@ class SetupScript
       if Dir.exist?(folder_path) && File.exist?(gemfile_path)
         Dir.chdir(folder_path) do
           puts "   Installing dependencies for #{folder_path}..."
-          unless system('bundle install')
+
+          unless system("[ -f Gemfile.lock ] && rm Gemfile.lock; bundle install")
             puts "❌ Bundle install failed for #{folder}"
             exit 1
           end
@@ -134,6 +136,28 @@ class SetupScript
     end
   end
 
+  def update_rubygems_and_bundler
+    puts "📦 Updating RubyGems and Bundler..."
+
+    if RUBY_VERSION >= "3.0"
+      unless system("sudo gem update --system --silent")
+        puts "❌ RubyGems update failed"
+        exit 1
+      end
+    else
+      unless system("sudo gem update --silent --system 3.4.22")
+        puts "❌ RubyGems update failed"
+        exit 1
+      end
+
+      # sentry-sidekiq does not bundle with Bundler 2.5.x that ships with RubyGems 3.4.22
+      unless system("sudo gem install bundler -v 2.4.22")
+        puts "❌ Bundler installation failed"
+        exit 1
+      end
+    end
+  end
+
   def install_foreman_gem
     unless system('gem install foreman')
       puts "❌ Foreman gem installation failed"