Mounts unlike stage options, shouldn't be stage specific. We have
filesystem specific mount types, differentiated by their type string.
Mounts can define their own additional options if necessary.
The top level Mounts type is simply an alias to a Mount array.
Signed-off-by: Achilleas Koutsou <achilleas@koutsou.net>
osbuild has recently got support for specifying mounts as an array. This
commit takes advantage of it and uses this new format.
This allows us to specify the order of mounts which is important because
we cannot mount /boot/efi before / is mounted.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>