Create multi-arch manifest copy, rather than retagging. #252
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docker tag SOURCE TARGETisn't aware of multi-arch image manifests.docker tagtherefore isn't a copy of a manifest, but a new single-arch image. This leads to CI publishing single-arch images instead of multi-arch as noted here: #245 (comment).For multi-arch images / manifest lists, we should instead use
docker buildx imagetools create, so the manifest list is preserved.