Update release instructions to remove `-debug` (#646)
Update release instructions to remove `-debug` (#646)

Leftover reference to the old `-debug` image and builds that we don't do
anymore.

Co-authored-by: XAMPPRocky <6ba45292a2270275b065ccb8b5a1b00bba5fbcfb@users.noreply.github.com>
googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin