feat: Adding read instance ips in connection metadata (#349)

Author: jahnavi2k

modules/v2/metadata.yaml

@@ -217,7 +217,7 @@ spec:
               source: github.com/GoogleCloudPlatform/terraform-google-alloy-db
               version: ">= 5.0.1"
             spec:
-              outputExpr: "{\"ALLOYDB_INSTANCE_HOST\" : primary_instance_ip}"
+              outputExpr: "{\"ALLOYDB_INSTANCE_HOST\" : primary_instance_ip, \"ALLOYDB_READ_REPLICAS\": env_vars.ALLOYDB_READ_REPLICAS}"
               inputPath: env_vars
       - name: create_service_account
         description: Create a new service account for cloud run service