nightly-multilib: remove Publish steps
nightly-multilib: remove Publish steps

Save some space by removing Publish steps, I think
nobody downloads the multilib images from AB.

Signed-off-by: Stefan Stanacar <c20d06ca38b23d3f5513beff3e05a256223610df@intel.com>

denny820909/builder,denny820909/builder,denny820909/builder,denny820909/builder