The second mount works if the device is already part of the `bcachefs
format` but fails if it's added afterwards. In particular the `blkid`
output is interesting.
Use nixos-test scaffolding to spawn VMs and run any scripts in
`checks/*.sh` as tests inside of the VM. This should lessen the risk of
any obvious breakage in the CI but needs more and better tests to cover
more commands.
Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>
