fix cors origin value

templates/backend-deployment.yaml

@@ -40,9 +40,9 @@ env:
     value: {{ .Values.keycloak.authUrl }}
   - name: KEYCLOAK_CLIENT_ID
     value: {{ .Values.keycloak.clientId }}
-  - name: CORS_ORIGIN_STRING
-    value: localhost:3000
 {{- end }}
+  - name: CORS_ORIGIN_STRING
+    value: {{ include "cybco.call-in-virtual-context" (list "cybco.external.url" . "" "frontend") }}
   - name: DEV_FLAG_LXS_ENABLED
     value: {{ .Values.features.lxs | quote }}
 {{- if .Values.features.lxs }}