Depend on railties and not on rails gem

[deepj]

Hello,
in my Rails application, I don't use the whole Rails default stack - For example I don't need to use any ActionText or ActionMailbox gem.

Unfortunately, depending onrails gem enforces non-needed gem with this gem. This gem for working depends on a small fraction of Rails stack and can work only three railties, actioncable and listen gems. It's better to require only these gem as necessary dependencies.

I created a similar PR (rails/jsbundling-rails#13) to this issue in jsbundling-rails two years ago (accepted).

E.g. tailwindcss-rails or cssbundling-rails depends on railties gem as well

• https://github.com/rails/tailwindcss-rails/blob/main/tailwindcss-rails.gemspec#L21
• https://github.com/rails/cssbundling-rails/blob/main/cssbundling-rails.gemspec#L14

[kirillplatonov]

@deepj great idea, thank you!