Update testing image tag to ceec961

Author: github-actions[bot]

helm/echo/values-testing.yaml

@@ -1,5 +1,5 @@
 global:
-  imageTag: "f722eef"  # Will be updated by CI/CD
+  imageTag: "ceec961"  # Will be updated by CI/CD
   registry: "registry.digitalocean.com/dbr-cr"
 
 # Common configuration shared across services