Make sure you have bash, docker. Python and some test hacks are crammed into the `Dockerfile_build` file for now. Revisions in the future may re-enable running python on your host (not just in docker).
You can run the multiarch images on an amd64 development system if you [enable binfmt-support as described in the multiarch image docs](https://hub.docker.com/r/multiarch/multiarch/debian-debootstrap/)