Fix actioncable autoload problem

The CI test pipeline breaks for Rails 7.1. The eager loading results into a Zeitwerk error in the turbo-rails gem. The current solution is to include actioncable if the application is running in a Github Action until this bug is fixed.

Ref: hotwired/turbo-rails#512

Gemfile

@@ -26,6 +26,11 @@ group :development, :test do
     # Necessary because GH Actions gem cache does not have this "Bundled with Ruby" gem installed
     gem "rexml", "~> 3.2.4"
     gem "sassc", "~> 2.4.0" # https://github.com/sass/sassc-ruby/issues/146
+
+    # https://github.com/hotwired/turbo-rails/issues/512
+    if rails_version == "7.1"
+      gem "actioncable", "~> #{rails_version}.0"
+    end
   else
     gem "launchy"
     gem "annotate"

spec/dummy/config/environments/test.rb

@@ -16,6 +16,11 @@
   # system, or in some way before deploying your code.
   config.eager_load = ENV["CI"].present?
 
+  # Issue: https://github.com/hotwired/turbo-rails/issues/512
+  if ENV["CI"].present?
+    Rails.autoloaders.once.do_not_eager_load("#{Turbo::Engine.root}/app/channels")
+  end
+
   # Configure public file server for tests with Cache-Control for performance.
   config.public_file_server.enabled = true
   config.public_file_server.headers = {