blubber.yaml: Revert buildctl base image
Debugging: Go back to the wmf-v0.12.5-8 tag of
docker-registry.wikimedia.org/repos/releng/buildkit for the buildctl
executable.
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Debugging: Go back to the wmf-v0.12.5-8 tag of
docker-registry.wikimedia.org/repos/releng/buildkit for the buildctl
executable.