Add manifest version for ostbuild-v3
Add manifest version for ostbuild-v3

vrutkovs/vrutkovs.github.io,djdeath/gnome-ostree,chergert/gnome-continuous,GNOME/gnome-ostree,chergert/gnome-continuous,vrutkovs/vrutkovs.github.io,tanty/gnome-ostree,aperezdc/gnome-ostree,cgwalters/gnome-ostree,tanty/gnome-ostree,aperezdc/gnome-ostree,chergert/gnome-continuous,cgwalters/gnome-ostree,cgwalters/gnome-ostree,vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,aperezdc/gnome-ostree,tanty/gnome-ostree,djdeath/gnome-ostree,djdeath/gnome-ostree,GNOME/gnome-ostree