Update Makefile.core.mk

Author: Ajay-singh1

Makefile.core.mk

@@ -83,6 +83,10 @@ ifeq ($(CURRENT_BRANCH),master)
 else ifneq ($(filter release-%, $(CURRENT_BRANCH)),)
   baseurl := https://istio.io/latest
 
+# If the CONTEXT environment variable is set to deploy-preview, we use the DEPLOY_PRIME_URL as the base URL
+else ifneq ($(CONTEXT),deploy-preview)
+  baseurl := $(DEPLOY_PRIME_URL)/latest
+
 # If the current branch is not master or release branch, we use /latest as the base URL
 # This is useful for feature branches or pull requests and deploy-preview
 else