Per request for more debug info on how the engine deals with multi-platform "manifest list" images, this adds information about the manifest list entries and whether it found an os/arch match, and the digest of the match. Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> Upstream-commit: 9a8cb9313c9c5eb535cf0bce25ca27f84bbfc570 Component: engine