Add busybox (shell) into from scratch container as volume mount for temporary shell

main.sh

#!/usr/bin/env bash

if [[ ! -d "busybox" ]]; then 
  curl -o busybox.tar.xz -L https://github.com/docker-library/busybox/blob/82bc0333a9ae148fbb4246bcbff1487b3fc0c510/uclibc/busybox.tar.xz?raw=true 
  mkdir busybox 
  tar -zxvf busybox.tar.xz -C busybox 
  rm busybox.tar.xz
fi

docker run -it --rm --entrypoint sh -v $(pwd)/busybox/bin:/bin hello-world