Merge "Add a warning message about missing gcert at the end of the build" am:...

Merge "Add a warning message about missing gcert at the end of the build" am: 4e3c2660 am: e4b4c45b

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2078459



Change-Id: I3295516fe1b3bc5184628a84f5ef2aad9a2974d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>