[`salt-image-builder`] Build Ubuntu 22.04 images

[myii]

Resolved with the following MR:

• https://gitlab.com/saltstack-formulas/infrastructure/salt-image-builder/-/merge_requests/143

---

Also had to add the ssh-rsa workaround:

• https://gitlab.com/saltstack-formulas/infrastructure/salt-image-builder/-/merge_requests/144