Create a tar ball with the contents of the / and /usr partitions
to be used as follows with systemd-nspawn (via machinectl):
machinectl import-tar flatcar-container.tar.gz flatcar-container
machinectl start flatcar-container
machinectl shell flatcar-container
or with docker by converting it to an OCI image:
docker import -c "CMD /bin/bash" flatcar-container.tar.gz flatcar-container
Since the new "prodtar" command relies on the results of the "prod" command,
it bundles it so that "prod prodtar" and "prodtar" is the same.
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