Work around helm v4 oci bug

helm/helm#31600

Signed-off-by: Richard Wall <richard.wall@cyberark.com>

Author: wallrj-cyberark

hack/ark/test-e2e.sh

@@ -16,6 +16,7 @@
 set -o nounset
 set -o errexit
 set -o pipefail
+set -o xtrace
 
 # CyberArk API configuration
 : ${ARK_USERNAME?}
@@ -65,8 +66,7 @@ kubectl create secret generic agent-credentials \
         --from-literal=ARK_SUBDOMAIN=$ARK_SUBDOMAIN \
         --from-literal=ARK_DISCOVERY_API=$ARK_DISCOVERY_API
 
-helm upgrade agent "oci://${ARK_CHART}@${ARK_CHART_DIGEST}" \
-     --version "${ARK_CHART_TAG}" \
+helm upgrade agent "oci://${ARK_CHART}:NON_EXISTENT_TAG@${ARK_CHART_DIGEST}" \
      --install \
      --wait \
      --create-namespace \