Add repo digest field to container payload

[badovm]

What does this PR do?

Adds repo digest field to container payload

Motivation

This is needed to plumb through the repo digest explicitly from the containers check. Used to reconcile the image id on the backend.

https://datadoghq.atlassian.net/browse/PROCS-3816

Additional Notes

Possible Drawbacks / Trade-offs

Describe how to test/QA your changes

Reviewer's Checklist

Reviewers: please see the review guidelines.

[badovm]

/merge

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[badovm]

/remove

[dd-devflow[bot]]

:steam_locomotive: Devflow: /remove

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[badovm]

/merge

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[badovm]

/merge

[dd-devflow[bot]]

:steam_locomotive: MergeQueue

Pull request added to the queue.

This build is going to start soon! (estimated merge in less than 0s)

Use /merge -c to cancel this operation!

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:rotating_light: MergeQueue

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