buildx/store
CrazyMax b1c5449428
builder: skip name validation for docker context
Although a builder from the store cannot be created unless
it has a valid name, this is not the case for a Docker context.

We should skip name validation when checking a node from the
store and fall back to finding one from Docker context instead.

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>
..
storeutil builder: skip name validation for docker context
nodegroup.go store: set nodegroup last activity
nodegroup_test.go driver: allow setting driver opts
store.go build: support for saving local state by build ref
store_test.go builder: skip name validation for docker context
util.go builder: skip name validation for docker context