In addition to the required base layer, provided via the the input
of the same name, the oci-archive stage now accepts up to nine
additional layers that get added on top of each other, sorted in
ascending order, i.e. `layer.1` to `layer.9`.
Adapt the `fedora-ostree-container` example manifest so that the
ostree commit is now in a separate layer, which makes it possible
to share the base layer between different commits container.
d4ebbb821a