prepare

mkdir rootfs

wget https://www.busybox.net/downloads/binaries/1.31.0-defconfig-multiarch-musl/busybox-x86_64 -O rootfs/busybox 

start container

sudo ./target/debug/container start -r rootfs -i "/busybox" -a "sh"

enter container

sudo ./target/debug/container enter -p PID -c "/busybox sh"