
Once we're satisfied that we will not be downgrading from Gerrit 3.10 to 3.9 we can safely drop the 3.9 image builds and testing. Followups will add forward looking 3.11 image builds and testing. Depends-On: https://review.opendev.org/c/openstack/project-config/+/937268 Change-Id: Ie46cd8b74147c835fbe5e414d13b3f7d3237c7cf