bump image prefix across the federation

effectively purges image cache, ensuring all builds are getting jlab 3.1

Author: minrk

config/ovh.yaml

@@ -8,7 +8,7 @@ binderhub:
       badge_base_url: https://mybinder.org
       sticky_builds: true
       use_registry: true
-      image_prefix: 3i2li627.gra7.container-registry.ovh.net/binder/ovhbhub-
+      image_prefix: 3i2li627.gra7.container-registry.ovh.net/binder/ovhbhub-r2d-g5b5b759
     DockerRegistry:
       # Docker Registry uses harbor
       # ref: https://github.com/goharbor/harbor/wiki/Harbor-FAQs#api

config/staging.yaml

@@ -5,7 +5,7 @@ binderhub:
     BinderHub:
       hub_url: https://hub.gke2.staging.mybinder.org
       badge_base_url: https://staging.mybinder.org
-      image_prefix: gcr.io/binderhub-288415/r2d-staging-72d7634-
+      image_prefix: gcr.io/binderhub-288415/r2d-staging-g5b5b759-
       sticky_builds: true
       build_memory_limit: "2G"
   extraEnv:

config/turing.yaml

@@ -13,7 +13,7 @@ binderhub:
       sticky_builds: true
       # Docker Hub registry for Turing
       use_registry: true
-      image_prefix: turingmybinder/binder-prod-
+      image_prefix: turingmybinder/binder-prod-r2d-g5b5b759-
 
   replicas: 1