💩(backend) notify the summary service when a new recording is available

Draft a piece of code to try the feature in staging. I'll consolidate this
implementation ASAP, as soon we have a first implementation functional.

What's missing?
- when owners are multiple
- retry when the backend cannot reach the summary service
- factorize the key oneliner, duplicated from the egress service
- optimize SQL query
- unit tests

src/helm/env.d/dev/values.meet.yaml.gotmpl

@@ -59,6 +59,8 @@ backend:
     RECORDING_VERIFY_SSL: False
     RECORDING_STORAGE_EVENT_ENABLE: True
     RECORDING_STORAGE_EVENT_TOKEN: password
+    SUMMARY_SERVICE_ENDPOINT: http://meet-summary:80/api/v1/tasks/
+    SUMMARY_SERVICE_API_TOKEN: password
 
 
   migrate: