Update configuration.prod.yaml

Added support for overriding the url for both the apis and backends when promoting across environments.

Author: waelkdouh

configuration.prod.yaml

@@ -30,3 +30,8 @@ apis:
       - name: applicationinsights
         verbosity: Error
         loggerId: "/subscriptions/[subscripotion id]/resourceGroups/rg-apim-lab-prod/providers/Microsoft.ApiManagement/service/apim-prod-wk-05102022/loggers/apim-lab-prod-insights"
+  - name: myapi
+    serviceUrl: https://mysite.com
+backends:
+  - name: mybackend
+    url: https://myenvironmenturl.com