Build drivers table and OCI/Docker exporter page say the docker driver can't export tarballs or multi-platform images #26372

Two pages say that the default docker driver can't do something it can do with the containerd image store:

• Build drivers: the table leaves Tarball output and Multi-arch images empty for docker.
• OCI and Docker exporters: "The docker driver doesn't support these exporters. You must use docker-container or some other driver."

With the containerd image store, which is the default for Docker Desktop and for fresh Docker Engine 29.0+ installations (containerd image store), both work with the docker driver. Multi-platform builds already says that no extra setup is needed in that case, so the pages disagree.

$ docker buildx build --builder desktop-linux --output type=oci,dest=out-oci.tar .        # exit 0, tar has index.json, oci-layout
$ docker buildx build --builder desktop-linux --output type=docker,dest=out-docker.tar .  # exit 0, tar has index.json, manifest.json, oci-layout
$ docker buildx build --builder desktop-linux --platform linux/amd64,linux/arm64 \
    --output type=oci,dest=out-multi.tar .                                              # exit 0, index.json has an image index

I can open a PR that marks these cells as supported with the containerd image store and updates the exporter page.

This report was prepared with the help of an AI assistant (Claude); I reviewed and verified it.

🤖 Generated with Claude Code