Use MCR image for dashboard (#397)

Author: samiyaakhtar

spk-config.yaml

@@ -16,7 +16,7 @@ infra:
 
 introspection:
   dashboard:
-    image: "samiyaakhtar/spektate:prod" # Use this default docker image unless you would like to use a custom one
+    image: "mcr.microsoft.com/k8s/bedrock/spektate:latest" # Use this default docker image unless you would like to use a custom one
     name: "spektate"
   azure: # This is the storage account for the service introspection tool.
     account_name: "storage-account-name" # Must be defined to run spk deployment commands