Evaluate how safe our usage of di-netboot-assistant is

It lives in the libvirt::host::di_netboot_assistant class and libvirt::host::di_netboot_assistant::distribution defined resource in https://git-tails.immerda.ch/puppet-libvirt.

Related issues

Related to #10092 (closed)

Original created by @intrigeri on 8507 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information