📝(backend) use certifi certificate for livekit-api dependency

LiveKit uses aiohttp which relies on the ssl module under the hood.
Set certificate file using an env variable, similar to @rouja's fix
for the request module.

This tweak applies only in the dev environment.

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

@@ -61,6 +61,7 @@ backend:
     RECORDING_STORAGE_EVENT_TOKEN: password
     SUMMARY_SERVICE_ENDPOINT: http://meet-summary:80/api/v1/tasks/
     SUMMARY_SERVICE_API_TOKEN: password
+    SSL_CERT_FILE: /usr/local/lib/python3.12/site-packages/certifi/cacert.pem
 
 
   migrate:

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

@@ -89,6 +89,7 @@ backend:
         name: backend
         key: BREVO_API_KEY
     BREVO_API_CONTACT_LIST_IDS: 8
+    SSL_CERT_FILE: /usr/local/lib/python3.12/site-packages/certifi/cacert.pem
 
 
   migrate: