[Bug 796644] Add git update hook to Tracker git repo

["sysadmin" (GNOME Bugzilla) <bugzilla gnome org>]

Comment # 2 on bug 796644 from Carlos Garnacho

Hmm, it was kinda deliberate, from pre-receive docs in
https://git-scm.com/docs/githooks:

"If the hook exits with non-zero status, none of the refs will be updated. If
the hook exits with zero, updating of individual refs can still be prevented by
the update hook."

I liked the per-ref nature, but it's probably a bit unimportant (eg. allowing
to push WIP work while forbidding on master/stable branches). If you deem
pre-receive a better place for that, I can change the script to take input as
pre-receive hooks do.

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