[cinder] Vancouver PTG scheduling

Hello Vancouver-bound Argonauts, In trying to put together a doodle pool, I found it was way easier to just use an etherpad. So please navigate on over to it and block out your unavailability before the Cinder Spec Review meeting at 1400 UTC on Friday 9 June. https://etherpad.opendev.org/p/vancouver2023-cinder-ptg-scheduling thanks, brian