One option would be to start the webclient service and map a drive to the
Sharepoint Server's forms library... eg.  net use z:
http://localhost/spslibraryname and then copy the xsn file to the forms
directory, or do the same through any http protocol.

This assumes the xsn file has been previously generated against a test
sharepoint site though.

There should be another way through .js code automation, hopefully someone
can send a link as it is something I need too in order to automatically sign
a form and publish.