lake configuration option to suppress warning about out of date manifests?

[semorrison]

Advising mathlib users to run lake update because their manifest is out of date seems to be a recipe for confused users!

Can we allow a configuration setting that suppresses this warning entirely except for particular users who "opt-in" (opting in would have to be done via some not-checked-in-to-git configuration option)?

[semorrison]

On further reflection I am less keen on this approach. Better will be to have CI ensure that users never see this warning except because of their own actions, and separately to build some guard rails around lake update.