Make necessary changes to podman-machine-os to support bootc commands.

As part of the transition to using bootc for machine OS management, the podman-machine-os image needs modifications to ensure bootc commands function properly. This work enables the bootc switch and upgrade functionality being implemented in podman machine commands.

Acceptance Criteria

This should be filled in by the assignee prior to the card going to code review and preferably earlier.

• [ ] Criterion 1
• [ ] Criterion 2
• [ ] Criterion 3