Auto Secure boot key enrollment with disk images

[bsloeserwij]

As discussed in the Slack channel: https://taloscommunity.slack.com/archives/CMARMBC4E/p1767874009521259.

I try to boot Talos with secure boot enabled from a disk image. To fully automate this I want to auto enroll the secure boot keys. This is already a feature when the ISO is used, but not using disk images (@frezbo told me). I think this would be a great feature to support (if possible of couse).