Split bin/rails test test:system into two steps:

- `bin/rails test test:system` is not a thing. The `test:system`
  part is silently discarded.

  This should be loudly failing with the change I'm trying to add
  in rails#54741, and there are
  discussions in rails#54736 whether running multiple commands à la rake
  should be supported.

  But in the meantime, modifying this into two steps would ensure
  your system tests actually run.

Author: Edouard-chin

railties/lib/rails/generators/rails/app/templates/config/ci.rb.tt

@@ -19,7 +19,8 @@ CI.run do
 <% if options[:api] || options[:skip_system_test] -%>
   step "Tests: Rails", "bin/rails test"
 <% else %>
-  step "Tests: Rails", "bin/rails test test:system"
+  step "Tests: Rails", "bin/rails test"
+  step "Tests: System", "bin/rails test:system"
 <% end -%>
   step "Tests: Seeds", "env RAILS_ENV=test bin/rails db:seed:replant"
 

railties/test/application/bin_ci_test.rb

@@ -19,7 +19,8 @@ class BinCiTest < ActiveSupport::TestCase
         # Default steps
         assert_match(/bin\/rubocop/, content)
         assert_match(/bin\/brakeman/, content)
-        assert_match(/bin\/rails test/, content)
+        assert_match(/"bin\/rails test"$/, content)
+        assert_match(/"bin\/rails test:system"$/, content)
         assert_match(/bin\/rails db:seed:replant/, content)
 
         # Node-specific steps excluded by default