We want to start looking at testing OpenShift on RHCOS built from RHEL 9.4 packages. While it is currently possible to do most of that testing work using OKD-SCOS, only the x86_64 architecture is available there. We'll publish OCP release images and boot images that include RHCOS builds made out of CentOS Stream packages to prepare for the RHEL 9.4 release.

Summary of the steps:
1. Add manifests for a new rhel-9.4 variant in openshift/os, based on the existing manifests for rhel-9.2 and c9s. We'll use as much C9S packages as possible and re-use existing OpenShift specific packages.
2. Update the staging pipeline configuration to add a 4.15-9.4 stream.
3. Trigger an RHCOS build and use it to replace an existing image from a nightly OCP release image. Upload this release image to the rhcos-devel namespace on registry.ci.openshift.org
4. Ask for as many people as possible to test this release image. Write an email to aos-devel, publish updated instructions in this Epic, publish the same instructions in the Slack channel.
5. Repeat steps 3 and 4 every two weeks