tests: Add a test case for unwritable repos
tests: Add a test case for unwritable repos

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