setup-alpine: disabling setup-user in ANSWERFILE

With new setup-user and related USEROPTS in ANSWERFILE, it is not possible properly disable user account creation in setup-alpine -f ANSWERFILE.
Indeed USEROPTS=none creates user none !...

USEROPTS=-h can serve as a workaround but some proper option would be nice.

Overall, a more consistent OPTS mechanism would be nice to disable features (sometimes unset variables, sometimes none, etc..). i.e: setup-interface also needs to be touched: no option to just keep as-is

How about having a common option (-i, -I, or else) for each setup-* (or their calling steps within setup-alpine) to ignore?