fix(deploy): mention network security for Docker Compose deployments

Author: slint

docs/operate/ops/deploy.md

@@ -60,7 +60,10 @@ scope of this documentation.
     it requires knowledge and experience on how to run it reliably, safely stores
     files with backups, managing software and infrastructure upgrades, understand
     potential performance limitations (a single machine probably might not handle all
-    your traffic and it would be a single point of failure), etc.
+    your traffic and it would be a single point of failure), etc. More importantly,
+    there are critical [network security aspects](https://docs.docker.com/engine/network/packet-filtering-firewalls/)
+    to take into account when exposing services using Docker containers that require
+    special attention to avoid exposing your infrastructure to the internet.
 
     **Use at your own risk.**