Bug#901030: some context
This issue was discovered while working on getting autopkgtest running
smoothly in Docker containers running in Gitlab CI on salsa.debian.org:
When running autopkgtest in a gitlab-ci docker container, it can run
directly in it since it has root access. But since the Docker host
provides the kernel, the Docker host must have binfmt-support installed
and the binfmt_misc kernel module loaded in order for Docker containers
to use binfmt.