Avoid using yarn check

[iusztin]

I think it would be better to avoid using yarn check in the future. (E.g. the yarn integrity check feature depends on this.)

Why?

• The feature will be removed from yarn in the future: Remove yarn check yarnpkg/rfcs#106
• It's already considered buggy and its use is officially discouraged: Yarn check reports errors after yarn install yarnpkg/yarn#6427 (comment)

Though I'm not sure about the alternatives currently.
What do you guys think about this?

[gondalez]

Would (optionally) running yarn install on boot be an alternative?

I imagine it replacing the current yarn check mechanism:

webpacker/lib/webpacker/railtie.rb

Line 31 in 90df6f5

initializer "webpacker.yarn_check" do |app|

Forgive me if this is a silly question 😅

[connorshea]

It'll be removed in yarn 2.0, which should be coming sometime in the next few months(?), so we should replace this soon.

[rossta]

Fixed by #2518