Add support for multi-arch OCI image indexes in Bazel builder about skaffold HOT 2 OPEN

This would be really useful. Looks like Docker Engine doesn't support OCI-format multi-arch tarballs out of the box, rules_oci doesn't produce Docker-format multi-arch tarballs, and skaffold doesn't currently support alternative container APIs like containerd. (https://github.com/GoogleContainerTools/skaffold/blob/main/pkg/skaffold/docker/image.go would need to be generalized). Might need a new bazel rule something like docker_tarball to make tarballs in the format docker API expects, or generalize skaffold to be able to communicate with a containerd

from skaffold.

I'm giving it a try in #9219.

I managed to make it load the index.json manifest, but performing the docker load operation locally is failing with the following error:

build [api] failed: loading image into docker daemon: reading from image load response: open /var/lib/docker/tmp/docker-import-3424243076/blobs/json: no such file or directory

It appears to be due to the fact that the Docker Engine API expects a very specific format for the tarball: https://docs.docker.com/engine/api/v1.43/#tag/Image/operation/ImageLoad

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