Add libvirt support

[sbernhard]

Requires:
fog/fog-libvirt#188
theforeman/foreman#10874
#181

[stejskalleos]

Failure: ForemanBootdisk::VmwareTest::#parse_args#test_0001_should add a cdrom drive while keeping other parameters when provision_method is bootdisk

test failures looks related

[stejskalleos]

Right now, creating a new host is failing with:

Failed to upload ISO image for instance ian-warmath.dhcp-libvirt.lan: undefined method `upload_iso' for #<Fog::Libvirt::Compute::Real:345020 @uri=#<Fog::Libvirt::Util::URI:0x0000000044ef5e40 @parsed_uri=#<URI::Generic qemu:/system>, @uri="qemu:///system"> @client=#<Libvirt::Connect:0x0000000044ef56c0>> Did you mean? upload_volume

And I get another batch of errors in the log, but I'm not sure whether they are related to this PR. I need to investigate before making connections.

[stejskalleos]

Nitpick: Is the respond_to?(:volumes) necessary?
The libvirt.rb heavily relies on it, so I think it's safe to assume that Libvirt responds to volumes.

[stejskalleos]

So, I figured out the other (irrelevant to this PR) errors, and still I got:

2026-03-03T10:31:01 [D|app|34214ee5] Processing task 'Upload ISO image to datastore for ella-cardello.dhcp-libvirt.lan' from 'Host::Managed Main'
2026-03-03T10:31:01 [I|app|34214ee5] Uploading ISO image /tmp/d20260303-84654-ghif0e/ella-cardello.dhcp-libvirt.lan.iso for ella-cardello.dhcp-libvirt.lan
2026-03-03T10:31:01 [W|app|34214ee5] Failed to upload ISO image for instance ella-cardello.dhcp-libvirt.lan: undefined method `upload_iso' for #<Fog::Libvirt::Compute::Real:380900 @uri=#<Fog::Libvirt::Util::URI:0x00007f081eb71128 @parsed_uri=#<URI::Generic qemu:/system>, @uri="qemu:///system"> @client=#<Libvirt::Connect:0x00007f081eb70e08>>
 34214ee5 | Did you mean?  upload_volume
2026-03-03T10:31:01 [I|app|34214ee5] Backtrace for 'Failed to upload ISO image for instance ella-cardello.dhcp-libvirt.lan: undefined method `upload_iso' for #<Fog::Libvirt::Compute::Real:380900 @uri=#<Fog::Libvirt::Util::URI:0x00007f081eb71128 @parsed_uri=#<URI::Generic qemu:/system>, @uri="qemu:///system"> @client=#<Libvirt::Connect:0x00007f081eb70e08>>
 34214ee5 | Did you mean?  upload_volume' error (NoMethodError): undefined method `upload_iso' for #<Fog::Libvirt::Compute::Real:380900 @uri=#<Fog::Libvirt::Util::URI:0x00007f081eb71128 @parsed_uri=#<URI::Generic qemu:/system>, @uri="qemu:///system"> @client=#<Libvirt::Connect:0x00007f081eb70e08>>
 34214ee5 | Did you mean?  upload_volume
 34214ee5 | /home/lstejska/plugins/foreman_bootdisk/app/models/concerns/foreman_bootdisk/compute_resources/libvirt.rb:17:in `iso_upload'
 34214ee5 | /home/lstejska/plugins/foreman_bootdisk/app/models/concerns/foreman_bootdisk/orchestration/compute.rb:59:in `bootdisk_upload_iso'
 34214ee5 | /home/lstejska/plugins/foreman_bootdisk/app/models/concerns/foreman_bootdisk/orchestration/compute.rb:80:in `setIsoImage'

[sbernhard]

Mark as draft because it needs fog/fog-libvirt#188