[mvp] Populate .build_id after cipd_manifest.json creation

Change-Id: I92961c793a9561f0a7ba277831632986357a8ef5
Reviewed-on: https://fuchsia-review.googlesource.com/c/sdk-samples/fortune-teller/+/683583
Reviewed-by: Darren Chan <chandarren@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Fuchsia-Auto-Submit: Jiaming Li <lijiaming@google.com>