validate compose_spec

Author: giancarloromeo

services/director-v2/src/simcore_service_director_v2/models/dynamic_services_scheduler.py

@@ -540,8 +540,10 @@ def from_service_inspect(
     def as_label_data(self) -> str:
         # compose_spec needs to be json encoded before encoding it to json
         # and storing it in the label
-        return self.model_copy(
-            update={"compose_spec": json.dumps(self.compose_spec)}, deep=True
+        return self.model_validate(
+            self.model_copy(
+                update={"compose_spec": json.dumps(self.compose_spec)}, deep=True
+            )
         ).model_dump_json()
 
     model_config = ConfigDict(extra="allow", populate_by_name=True)