Apptainer (https://apptainer.org/docs/admin/main/installation.html#install-unprivileged-from-pre-built-binaries) can be installed and run without root privileges and also integrates more nicely into the system by eg. making $HOME available and running as the user’s uid in the container.

It would seem to be more suitable than docker (runs as root, files created are owned by root) for a tutorial.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2791/use-apptainer-rather-than-docker-for-local