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Use image digest for helper images

Mitchell Nielsen requested to merge use-image-digests into master

What does this MR do?

Use image digest for helper images

Uses image digest for:

  • kubectl
  • alpine-certificates
  • cfssl-self-sign

This ensures that we're pulling an immutable image.

When we update the image contents, it will generate a new digest. We'll then update the charts to reference that new digest to ensure the updated image is only pulled when specified.

This helps us address the fact that tags are mutable.

Related issues

Related to #1896 (closed)

Related to #3143 (closed)

Checklist

See Definition of done.

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

Required

  • Merge Request Title and Description are up to date, accurate, and descriptive
  • MR targeting the appropriate branch
  • MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

  • Test plan indicating conditions for success has been posted and passes
  • Documentation created/updated
  • Tests added
  • Integration tests added to GitLab QA
  • Equivalent MR/issue for omnibus-gitlab opened
Edited by Mitchell Nielsen

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