Merge pull request rails#52913 from koic/suppresss_rubocop_offense_after_rails_new_devcontainer

Suppress a RuboCop offense after running `rails new` with `--devcontainer`

Author: rafaelfranca

railties/lib/rails/generators/rails/devcontainer/devcontainer_generator.rb

@@ -150,7 +150,7 @@ def local_rails_mount
         end
 
         def system_test_configuration
-          optimize_indentation(<<-'RUBY', 2)
+          optimize_indentation(<<-'RUBY', 2).chomp
             if ENV["CAPYBARA_SERVER_PORT"]
               served_by host: "rails-app", port: ENV["CAPYBARA_SERVER_PORT"]