Support automounting of alpine iso file
Created by: CasperVector
... so that if
isodev=UUID=xxxxxxxx isoloop=/path/to/alpine.iso is provided in the kernel command line (of course, for this to actually work,
isofs and perhaps
ntfs need to be appended to the
modules=... option), the initramfs will, upon failure mounting the boot media, attempt to mount the alpine iso file at the specified path of the specified device.