Make sprockets dependency optional

[joker-777]

It looks like sprockets will be soon replaced by propshaft. It would be great if we could make the sprockets dependency optional. (#403)

[gap777]

@ldlsegovia @GabrielLyonB et al... this PR removes a dependency upon sassc-rails, which happens to also make it compatible with Rails 7 + css-bundler (tailwind) + js-bundler (esbuild), which we need in order to use your awesome activeadmin_addons package.

Could you approve this and merge it in?

[joker-777]

Sorry, I just realized that I created the PR based on my master branch where I pushed lots of other changes I need for my project. Unfortunately, it seems that activeadmin_addons isn't maintained anymore :(

[gap777]

@joker-777 So sad-- we really liked your changes here!

[joker-777]

Thanks, maybe I will create another PR but I doubt that there is anyone maintaining this repository.

[ldlsegovia]

@joker-777 We're still alive, thankfully :) Creating a new PR with the sprockets related changes sounds good.

[joker-777]

@ldlsegovia This is good news!!! I will try to create a new PR then.

Can you also have a look at my other PRs, please?
#419
#423

[difernandez]

Hi all, sorry for the late comment. Wanted to let you know that we are planning a beta release for a new major version of this gem, which will drop support for sprockets, among other things. Theses changes will include the removal of sassc and sassc-rails dependencies. We’ll leave the related issues open for now, at least until the release of this version, but will be closing related PRs, as we might need to include similar changes in the removal of sprockets support.