e2e: use minikube OS with nbd dynamic module

For rbd-nbd testing purpose, this is needed.
At least until we have minikube release with
kubernetes/minikube#10217

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

scripts/minikube.sh

@@ -189,6 +189,9 @@ fi
 # caller did set EXTRA_CONFIG in the environment
 EXTRA_CONFIG="${EXTRA_CONFIG} --extra-config=kubelet.resolv-conf=${RESOLV_CONF}"
 
+# TESTING: use alternative minikube OS which has nbd module in the VM
+EXTRA_CONFIG="${EXTRA_CONFIG} --iso-url=https://people.redhat.com/ndevos/minikube/minikube_add-nbd.iso"
+
 #extra Rook configuration
 ROOK_BLOCK_POOL_NAME=${ROOK_BLOCK_POOL_NAME:-"newrbdpool"}