ring is unusable in robust tactic automation

[JasonGross]

Description of the problem

Because Add Ring follows Import rather than Export and because there seems to be no way to pass a ring structure to the ring tactic locally, ring is unusable in automation that needs to be robust to reuse. Please add a variant of ring that allows passing the ring structure, or a way to pick up ring structure from the context. (Why not just make Add Ring register some typeclass instances?) (Presumably the same is true of field.)

Coq Version

8.11.0