Remove the need for -npc when using a container platform

[thomas-robinson]

Is your feature request related to a problem? Please describe.
Container platforms require the -npc for no parallel checkout when creating the checkout script. There is no check for this and fre does not just do this for you. If you don't add -npc the container build will fail in a mysterious way

Describe the solution you'd like
I would like the default to be no parallel checkout, at least for the container platforms.

Describe alternatives you've considered
We could also provide a check with an error message if -npc is not included, but it seems like podman container building will not support the parallel checkout the way we have them written.

Additional context