It seems that the github API is a little slow/laggy with regards to propagation of whether a release tag has been made or not.
This sleep should fix it and avoid having to retrigger builds.
This change adds a script and the needed build logic to create a draft github release and then upload the created binaries to it in order to make the actual publishing a lot less error prone.
The logic is currently that it only does this for all github tags, but not for every main build/push. This is handled by the checks in the script itself.
Change-Id: Ie172a8e4a97200de901a26a055aa5a8a54b60a2a
