fix: add 'default' network to condado-newsletter service in Docker Compose

docker-compose.prod.yml

@@ -25,6 +25,7 @@ services:
         condition: service_healthy
     networks:
       - external
+      - default
     environment:
       SPRING_PROFILES_ACTIVE: prod
       SPRING_JPA_HIBERNATE_DDL_AUTO: ${SPRING_JPA_HIBERNATE_DDL_AUTO:-update}