A multi-arch scratch image that makes it possible to cross-build images from scratch.
The Docker Hub automated builds only covers the amd64 image, while the arm32v6 and arm64v8 images are manually built on a Raspberry Pi Zero W and Raspberry Pi 4 respective and pushed to Docker Hub. The manifest is updated at the end of the automated builds, creating a trusted multi-arch latest tag (since the arm32v6 and amd64v8 images contain nothing beyond labels).
The problem that this image solves for is such a corner case that most people wouldn't run into it, so you can probably get away with FROM scratch. The problem arises when you are trying to build an image for another machine architecture, and have to use FROM scratch in your dockerfile, in which case the resulting image will be tagged as being for the build machine's architecture instead of the target architecture (even though Qemu was used).