Goal: support taking a set of RPMs as well as an arbitrary set of files in rootfs/overlays
(which we turn into an RPM) and using this builder container, generate
an output container that can be applied by the https://github.com/openshift/machine-config-operator/
Accepted inputs:
- rootfs/overlay: Arbitrary filesystem tree.
- rpms/overlay: Passed to
rpm-ostree install - rpms/overrides: Passed to
rpm-ostree override replace
Example: Dockerfile.test.