Toolbox image builder (tigen) is a simple utility to create oci images to for creating toolbox sessions.
docker or podman must be installed and available in your $PATH.
Install tigen using cargo:
sh
cargo install tigen
sh
tigen --image ubuntu:20.04
tigen use docker image name to build oci images. After that, you'll be able to jump into ubuntu lts 20.02 using toolbox:
sh
toolbox enter -d ubuntu -r 20.04