Merge pull request rails#52112 from y-yagi/fix_driven_by_for_devcontainer

Correctly output `driven_by` setting for Development Containers

Author: rafaelfranca

.github/workflows/devcontainer-smoke-test.yml

@@ -63,7 +63,7 @@ jobs:
           imageTag: postgresql
           push: ${{ github.repository_owner == 'rails' && 'filter' || 'never' }}
           refFilterForPush: refs/heads/main
-          runCmd: bin/rails g scaffold Post && bin/rails db:migrate && bin/rails test
+          runCmd: bin/rails g scaffold Post && bin/rails db:migrate && bin/rails test && bin/rails test:system
 
       - name: Stop all containers
         run: docker ps -q | xargs docker stop

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

@@ -148,7 +148,7 @@ def local_rails_mount
         end
 
         def system_test_configuration
-          <<~RUBY
+          <<~'RUBY'
               if ENV["CAPYBARA_SERVER_PORT"]
                 served_by host: "rails-app", port: ENV["CAPYBARA_SERVER_PORT"]