Service: Exlude disks of type cdrom

[roosterfish]

When creating local and remote storage pools the list of disks should not contain any cdrom drive.

Fixes #566

[roosterfish]

I was testing this with https://en.wikipedia.org/wiki/CDemu. My first though was just filter out read-only drives but as you could potentially use the drive to write to the CD the rom drive itself isn't ro.

[roosterfish]

@masnax it looks after 1/stable got updated the preseed cmd fails (e.g. https://github.com/canonical/microcloud/actions/runs/12649784309/job/35247023464?pr=576).

Did a bit of digging and it looks we are missing at least the first commit of the latest-candidate cherry picks in the packaging repo in the v1-candidate branch.

[masnax]

@masnax it looks after 1/stable got updated the preseed cmd fails (e.g. https://github.com/canonical/microcloud/actions/runs/12649784309/job/35247023464?pr=576).

Did a bit of digging and it looks we are missing at least the first commit of the latest-candidate cherry picks in the packaging repo in the v1-candidate branch.

I'm a bit confused how this ever worked because MicroCloud at v1 does not support reading preseed from stdin.