support user-created service account functionality for Cloud Build

[marktru]

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Description

support user-created service account functionality for Cloud Build

References

https://buganizer.corp.google.com/issues/199663639

[rileykarson]

Does this duplicate #10053?

[remmelt]

It seems like.

[marktru]

Dup of #10053

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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