test rpm-ostree rechunker

[renner0e]

• do updates work from one image to the next, how much bigger are they compared to before?
• is CI blowing up because rpm-ostree is crashing
• is the :stable image used as baseline for scheduled and manually triggered workflows
• stable-daily is used as baseline for merge queued PRs
• stable and stable-daily are not mixed up or anything
• not publishing unrechunked images
• not publishing old images as new ones
• ISOs still good?

[tulilirockz]

We should also test if removing the workaround service screws up anything so we dont run into a situation like the HHD rechunker. Like, from zirc to zirc w/o the workaround