[FEATURE] Support virtual media mount

[starbops]

Is your feature request related to a problem? Please describe.

This long-awaited feature could make several virtual machine provisioning use cases possible. With this feature implemented, we will be able to dynamically attach an ISO image to the target virtual machine and boot from it.

Describe the solution you'd like

My initial thought is, this will need a third-party storage solutions to handle the volume lifecycle. We should do our best to make our part as neutral as possible, at least giving users the ability to choose which solution to use via configuration. As I use Harvester a lot, Longhorn seems a good fit. However, CDI could also be a valid candidate. With that said, both are a bit overkill for our use case. If this is infeasible or intolerable, we must handle the image and volume ourselves.

Describe alternatives you've considered

N/A

Additional context

This is one of the remaining item from #2.

[starbops]

This is how people deal with virtual media mount with the sushy-tools BMC emulator, hope this can shed some lights:
https://docs.openstack.org/sushy-tools/latest/user/dynamic-emulator.html#virtual-media-resource

[MartijnStraatman]

I read something about a storage requirement. Maybe a solution could be something like this

virtctl image-upload pvc live-iso-sno  \
  --size 2Gi --storage-class ocs-storagecluster-ceph-rbd \
  --access-mode ReadWriteOnce \
  --image-path rhcos-4.14.0-x86_64-live.x86_64.iso

Storage must be available then through pvc's.