Run fmriprep-docker as user (-u) by default?

[oesteban]

This would allow users who are not in the docker group to run their workflows more conveniently without elevated privileges (provided they can run docker without sudo).

[effigies]

This seems reasonable to me, and pretty easy to auto-detect. We could check whether the scratch and output directories will be writable before dropping into Docker, too.

[effigies]

Been looking at this, and correctly handling Windows users is going to be a pain. I guess we could leave them as root and default to -u for posix users...

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.