generic-release-homebrew_pr_bottle_hash_updater is sometimes flaky

[scpeters]

We noticed in osrf/homebrew-simulation#2265 (comment) that the generic-release-homebrew_pr_bottle_hash_updater job (which is one of 2 jobs triggered after a successful bottle build) is sometimes flaky:

• https://build.osrfoundation.org/job/generic-release-homebrew_pr_bottle_hash_updater/1867/

Currently only the https://build.osrfoundation.org/job/generic-release-homebrew_triggered_bottle_builder/ is recorded in the build status, so we don't see if the bottle hash updater job fails. It would be helpful if both jobs triggered after a successful bottle build (the uploader and the hash updater) were included in the build status so we could confirm that they passed before merging.