use withMultiPlatformBuilder functionality
use withMultiPlatformBuilder functionality

Change-Id: Ia27de97d6d192b9f18c3e44bec40b5a3b4c40ece
Reviewed-on: https://gerrit.instructure.com/c/dockerfiles/+/294621
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
Reviewed-by: Alex Slaughter <11669a22a05ead38ed9badafd55ef4c5386724b6@instructure.com>

instructure/dockerfiles,instructure/dockerfiles,instructure/dockerfiles,instructure/dockerfiles