Please upload zsync files for KIWI Images (such as Live ISOs), this way one
could easily update e.g., from the previous to the current Tumbleweed ISO
without having to re-download the entire image, but only the blocks that have
actually changed. Ubuntu has been using zsync for this purpose since many
years.

User Story:
I as a Live ISO user am running
openSUSE-Tumbleweed-KDE-Live-x86_64-Snapshot20180530-Media.iso and I would like
to "upgrade" to the latest one,
openSUSE-Tumbleweed-KDE-Live-x86_64-Snapshot20180606-Media.iso. If there was a
.zsync file available at https://download.opensuse.org/tumbleweed/iso/, I would
have to download only a few MB. (Since there is none available today, I need to
re-download the full ISO image.)

References:
* https://github.com/SUSE/kiwi/issues/754
* https://github.com/SUSE/kiwi/issues/364
* https://github.com/openSUSE/open-build-service/issues/3193
* https://github.com/openSUSE/obs-build/pull/367