Introduce tests for supported features

[mrc0mmand]

Tracker for features we should have covered by a test case:

• Basic boot (included to have at least one ticked checkbox)
• LVM (ci: extend the test suite #8)
• LUKS (ci: extend the test suite #8)
• LUKS + LVM (ci: extend the test suite #8)
• iSCSI (ci: extend the test suite #8) (temporarily disabled)
• NFS (ip=dhcp, ip=<ipv4>, ip=<ipv6>, ...)
• NVMe over TCP
• RAID setups
• multi-NIC setups
  • bonding
  • vlans
• any combination of the above
• ???