The release tarballs need to be self-identifying so they can be compared to the git source tree in case a problem is reported against the layer from someone using the tarball.
http://git.yoctoproject.org/cgit/cgit.cgi/yocto-autobuilder/commit/?id=0b030e70e0af27d87ba238d496b69edca49d9330 This is a two part fix. For all but the releases, we'll grab the git archive and name it with the hash name. For releases, we will be including the release notes in the tarball which have the git hash.