Image pusher fixes

Arran Walkerrequested to merge
ajwalker/fix-image-pusher into main

What does this MR do?

Fixes pusher script:

  • Could miss pushing all specified tags.
  • buildx produces OCI Layout images that don't work with all tooling. This can be corrected before pushing.

Why was this MR needed?

Last release missed a tag, and uploaded images that podman didn't like.

What's the best way to test this MR?

  • Check that the image registry has all tags.
  • Check that the image registry has an image manifest tagged, and not an image index that points to an image manifest.

What are the relevant issue numbers?

Closes #38492 (closed)

Edited by Arran Walker

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