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Store image digest to file and use it for signing

Balasankar 'Balu' C requested to merge 634-cosign-get-digest-from-file into master

What does this MR do?

Instead of fetching digest from remote repository, store the digest in a local file as part of build, and use it for signing. While copying the image to other tags, verify the image hasn't been tampered with before copying.

Related issues

Closes #634 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

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  • Merge Request Title, and Description are up to date, accurate, and descriptive
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Expected (please provide an explanation if not completing)

  • Test plan indicating conditions for success has been posted and passes
  • Documentation created/updated
  • Integration tests added to GitLab QA
  • The impact any change in container size has should be evaluated
  • New dependencies are managed with dependencies.io
Edited by Robert Marshall

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