ci: remove docker mirror configuration

Instead of using a mirror, the CI registry is now pupulated with
container images that get pulled and tagged as if they get from Docker
Hub or other locations.

This is more of a manual mirror, as the Docker Registry mirror
functionality is not flexible enough for our usecase (push images
without providing them on docker.io).

Signed-off-by: Niels de Vos <ndevos@redhat.com>

deploy/container-registry.yaml

@@ -49,8 +49,6 @@ spec:
           volumeMounts:
             - name: container-images
               mountPath: /var/lib/registry
-            - name: config
-              mountPath: /etc/docker/registry
             - name: htpasswd
               mountPath: /auth
           env:
@@ -64,9 +62,6 @@ spec:
         - name: container-images
           persistentVolumeClaim:
             claimName: ceph-csi-image-registry
-        - name: config
-          secret:
-            secretName: container-registry-config
         - name: htpasswd
           secret:
             secretName: container-registry-auth