Save config for google chat notifications

[shobhitagarwal1612]

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Fixes #1177

Configures a google chat notifier when a build is passes / fails / timeouts on the master branch. https://cloud.google.com/build/docs/configuring-notifications/notifiers

How does it work?

Cloud run free tier:

Tested by removing the "master" filter and triggering a cloud build. A notification was sent to the google chat space after the build was complete.

@gino-m PTAL?

P.S. The same config can be extended to be used for web repo

[codecov-commenter]

Codecov Report

Merging #1194 (330aa81) into master (10e0938) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1194   +/-   ##
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  Coverage     29.64%   29.64%           
  Complexity      783      783           
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  Files           291      291           
  Lines          7638     7638           
  Branches        346      346           
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  Hits           2264     2264           
  Misses         5266     5266           
  Partials        108      108           

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[gino-m]

The config looks much less intimidating than I expected! Qq - does this also enable email notifications?

[shobhitagarwal1612]

The config looks much less intimidating than I expected! Qq - does this also enable email notifications?

No, email notifications would require configuring a SMTP server and saving the sender email credentials in the secret manager. https://cloud.google.com/build/docs/configuring-notifications/configure-smtp

This config is the only script that can be checked-in. Everything else was one-time setup using CLI.

[shobhitagarwal1612]

@gino-m Can we merge this now?

[shobhitagarwal1612]

@JSunde Can you please approve this?