Add missing sprockets-rails dependency

[waiting-for-dev]

Rails 7 doesn't have sprockets-rails as a dependency anymore [1].
However, it's a dependency on solidus_core [2].

We hadn't caught it because our test suite depends transitively on it
through sassc-rails [3] in solidus_backend [4] & solidus_frontend [5].

However, we had an incompatibility when using standalone solidus_core
(like in the dummy app for extensions) with Rails 7.

[1] - https://guides.rubyonrails.org/7_0_release_notes.html#railties-notable-changes

[2]

solidus/core/lib/spree/core.rb

Line 10 in 35d43a1

require "sprockets/railtie"

[3] - https://github.com/sass/sassc-rails/blob/8d0462d54b5b5dd84cb1df31823c3afaebb64534/sassc-rails.gemspec#L31

[4]

solidus/backend/solidus_backend.gemspec

Line 35 in 455754b

s.add_dependency 'sassc-rails'

[5]

solidus/frontend/solidus_frontend.gemspec

Line 34 in 455754b

s.add_dependency 'sassc-rails'

[kennyadsl]

Thanks! Can't we try to remove this require and use it only when needed?

[waiting-for-dev]

Thanks! Can't we try to remove this require and use it only when needed?

Hmmm... where would you put it? solidus_core has a manifest. Doesn't it mean that sprockets need to be required at boot time?

[kennyadsl]

I forgot that we have those shared sprockets assets. They are used both in frontend and backend. To be honest I do not think it's beneficial anyhow but definitely not something that we need to address now.