Add retries to image push.

[mitchfriedman]

This uses the default provided retry transport by
go-containerregistry as this originally had no retries
built in.

This is useful to avoid intermittent failures of image
registries when returning a retryable status code.

No Issue number.

Description

This uses the default provided retry transport by
go-containerregistry as this originally had no retries
built in.

This is useful to avoid intermittent failures of image
registries when returning a retryable status code.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Adds integration tests if needed.

See the contribution guide for more details.

Reviewer Notes

• The code flow looks good.
• Unit tests and or integration tests added.

Release Notes

All image pushes will now include retries with exponential backoff to avoid intermittent failures of registries.

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[mitchfriedman]

@googlebot I signed it!

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[tejal29]

tried it on my branch and it works.