[bitfolk] SSH query

Hi all,

Hoping to crowdsource your knowledge.

In Ubuntu/Debian, is it possible to set up the www-data user with SSH
access (for development purposes; read/write to the web server document
root) but not "shell access" otherwise?

The SSH will be pub-key only, but I already know how to do such things (to
avoid obvious "do it key only" suggestions).
Kind regards

Murray Crane