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pull the upstream image if the local image differs

Benjamin Tissoires requested to merge bentiss/ci-templates:wip/pull-upstream into master

For the person sending the MR to update an image tag, the CI would build a new image in the user repository. However, next time this user does a CI pipeline, the image used will be the one from this user, not the upstream one. This can lead to some issues:

  • we have to pull a different image for that user
  • the user image is different, and might not be correct, hiding some issues (for example if 2 MR set the same tag).

Ensure the used image is always the upstream one, by comparing the various sha (digest and layers).

Cc: @anholt, @daenzer, @whot

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