The realtime service network policy was missing the custom egress rules section
that allows configuration of additional egress rules via values.yaml. This caused
the realtime pods to be unable to connect to external databases (e.g., PostgreSQL
on port 5432) when using external database configurations.
The app network policy already had this section, but the realtime network policy
was missing it, creating an inconsistency and preventing the realtime service
from accessing external databases configured via networkPolicy.egress values.
This fix adds the same custom egress rules template section to the realtime
network policy, matching the app network policy behavior and allowing users to
configure database connectivity via values.yaml.
