get notified when a deploy fails

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**Tell us about your request**
What do you want us to build?
a webhook, sms, slack anything when a deploy fails

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Anything else we should know?

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Start with issue #213 in the aws/apprunner-roadmap repository and review its request for deployment-failure notifications. Define the notification channel and failure conditions before identifying the relevant App Runner integration points; the work is done when a specific, actionable notification approach and acceptance criteria are established.

Written by the indexing model from the issue text.