When building we should default to a dummy version unless otherwise specified so we don't get ourselves confused over what is official and what is not. Signed-off-by: Eli Uriegas <eli.uriegas@docker.com> (cherry picked from commit ffcd040b5c3bd4f81e1d1f11c32f9bb81e235ed1) Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>