gitlab: build containers with buildkit and metadata

According to the documentation to be able to use --cache-from for
remote registries you need to enable both buildkit and inline the
metadata. We want to do this to support pulling from gitlab when users
build their local docker images.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200701135652.1366-24-alex.bennee@linaro.org>
1 file changed