Using `dpkg --print-architecture` instead of the `uname -m` to abstract
the architecture value from the container images, which the build process
is running inside, to match exactly the behavior specified by the following
Docker file while not 'passthru' to the host.
Signed-off-by: Dennis Chen <dennis.chen@arm.com>
Upstream-commit: 803a756941f5e4b68429a3642d52585c8ea6dbaa
Component: engine