Support release target config for build_android_sandboxed am: 435c35122a

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2943309

Change-Id: I000ddd66e06be1fe585ec96d326100552752db0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>