Make iso_file more configurable

[rossmaclean]

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Description

When creating a VM, I can specify iso_file but no other configuration e.g. device. I can, however, specify this if I use the additional_iso_files array. The issue is that iso_file is mandatory, but does not let me configure it correctly.

Use Case(s)

My specific setup is running Proxmox on a Raspberry Pi. The issue I have is that the ISO has to be a scsi device, but the required iso_file attaches it as ide.

Potential configuration

I can see three potential ways that this could be fixed (this is not exhaustive, I'm sure there are other solutions):

1. Make iso_file* optional
   • Would avoid breaking existing configurations that people have
2. Make iso_file* optional with additional_iso_files i.e. require one of them
   • I think this would be the best option, as it won't break people's current configurations
3. Remove iso_file* and use additional_iso_files
   • I think this would be the ideal solution as I don't really understand why the first ISO is treated special instead of just part of the list of ISOs, but would probably break a lot of exisiting configurations
   • It would also probably make sense for additional_iso_files to be renamed to iso_files in this case

* When I say iso_file I am also referring to the other fields that accompany it e.g. iso_url, iso_storage_pool, iso_checksum

Potential References

Documentation for iso_file
Documentation for additional_iso_files