From Liz Rice talk at GOTO 2018.
go run main.go run /bin/bash
require root privileges to run.
docker run -d --rm --name ubuntufs ubuntu:20.04 sleep 1000
docker export ubuntufs -o ubuntufs.tar
docker stop ubuntufs
mkdir -p "$HOME"/ubuntufs
tar xf ubuntufs.tar -C "$HOME"/ubuntufs/