Akka HTTP bind to 127.0.0.1 versus 0.0.0.0 for container reachability
Bind interface choice for Akka HTTP in containers Goal: expose an Akka HTTP server only to intended callers while allowing the container orchestrator or sidecar to reach it. `Http().newServerAt(interface, port)` binds to the supplied interface, so `127.0.0.1` keeps traffic local to the host, whereas `0.0.0.0` accepts IPv4 connections from every interface. Co