We need notiication, if staging or chromeos scripts breaks

When something breaks in staging or chromeos script (docker permission issues, rate limits, obsolete patch) often it breaks staging and we are not aware about that, sometimes up to several days.
I think it will be nice to have trap function in this scripts that invoke mail client and send alert to sysadmins/developers/deploy maintainers.

Locate the staging and ChromeOS scripts mentioned in the issue and review how failures such as Docker permission issues, rate limits, and obsolete patches are handled. Define the notification path and recipients, then verify that script failures alert the relevant sysadmins, developers, or deployment maintainers.

索引モデルが issue の本文から書いたものです。