Improve disk compaction by trimming the disk
This only affect the qemu and virtualbox image. I'm not sure how you
enable trim support in VMware and the documentation is spare.
Tested with: packer build -only=qemu local.json
698M Arch-Linux-x86_64-libvirt-2020-08-01.box <- before
425M Arch-Linux-x86_64-libvirt-2020-08-01.box <- after
Fix #106
I haven't been able to test this with VirtualBox as it crash (guru meditation).
I did consider removing the write_zeroes
logic, but it could still be useful for VMware users. Should we remove it?
Edited by Kristian Klausen