Set self signed CA via environment variables am: 69c89f53ae

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Car/DebuggingRestrictionController/+/13413083

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I827099ec94805745df81433f1209a1c6a18a52ee