gnomeos: Initial commit should be a compose
gnomeos: Initial commit should be a compose

This is just cleaner - we know where the ref came from, rather
than making it a copy, and also we can use it with the new
--recompose bits to keep adding to it.

resin-io/ostree,sujitfulse/ostree,gatispaeglis/ostree,leandrosansilva/ostree,GNOME/ostree,resin-io/ostree,leandrosansilva/ostree,sujitfulse/ostree,sujitfulse/ostree,leandrosansilva/ostree,GNOME/ostree,resin-io/ostree,sujitfulse/ostree,sujitfulse/ostree,gatispaeglis/ostree,resin-io/ostree,GNOME/ostree,gatispaeglis/ostree,resin-io/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,leandrosansilva/ostree,leandrosansilva/ostree