added spid-sp-test metadata in target_based_routing to spid backend

example/plugins/microservices/target_based_routing.yaml

@@ -5,6 +5,7 @@ config:
 
   target_mapping:
     # test platforms
+    "https://localhost:8080": "spidSaml2"
     "http://idpspid.testunical.it:8088": "spidSaml2"
     "https://validator.spid.gov.it": "spidSaml2"
     "https://localhost:8443": "spidSaml2"