Remove Vagrant cache-mechanism from build configuration as it might break on some filesystems
on some filesystems (i.e. zfs) its only possible to build tails with the libvirt cache attribute set to ‘writethrough’ instead of ‘none’ in the Vagrantfile. i guess thats a corner case, but maybe that should be configurable via env.
Feature Branch: bugfix/14404-remove-vagrant-disk-cache-setting
- Blocks tails/accounting#15334