Given the other comments here, and specifically How can I use snap when I don't use /home/$USER?, I think that this post should be updated to say make a bind mount, and also update the passwd database, i.e. /etc/passwd as @lucyllewy proposed. Also I think we should make this post into the docs category so it is editable. Unclear if we want this to go to the snapcraft.io/docs or not however
@degville thoughts on expanding a bit on this and putting it into the docs category and potentially also putting it on snapcraft.io/docs ?