This commit adds BuildOptions.Debug that allows skipping the evaluation of the
ResultHandler. The ResultHandler is created without evaluated, so calling Build
API with this flag always returns an error with the reference ID of that
(errored) ResultHandler. Note that this state of ResultHandler doesn't contain
result nor error so any operation on that ResultHandler will result in an error.
Following commit will allow user to do further operations (e.g. evaluation of a
bulid) using the buildkit client held by that ResultHandler.
Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
de693264a8