New repository format for v4.0 branch
This is secondary merge-request. Master MR is here: https://gitlab.labs.nic.cz/turris/turris-build/merge_requests/6
After this is merged it is required to update turris-os-*-kittens-* jobs on Jenkins to point to v4.0 instead of new-repo-4.0.
Edited by Karel Koci