Docker has had an experimental feature for some time to build containers cross architecture [1]. I'm guessing this transition is a good excuse to finish that up. Running cross architecture containers with only Docker is not possible as far as I know.

I'm guessing that we're going to have to see a lot better adoption of cross-platform container builds because of this.

[1]: https://docs.docker.com/buildx/working-with-buildx/#build-mu...