new-release.sh: Be smart on chosen hash when there are collisions
When there are different hashes between boards or lists then we should do some sensible choice. Currently we prefer one from first board but that is not ideal. In case of turris-build hash we use the one from lists as those are build very fast and we suspect that those are newest but that is not ideal as well.
The ideal solution would be to choice the newest has from all and tag that one.