fix(docker): fail closed on bottle enumeration

bot_bottle/backend/docker/infra_launch.py

@@ -89,6 +89,11 @@ def running_agent_containers(
         "docker", "network", "inspect", "--format",
         "{{range .Containers}}{{.Name}}\n{{end}}", network,
     ])
+    if proc.returncode != 0:
+        detail = proc.stderr.strip() or f"exit {proc.returncode}"
+        raise InfraLaunchError(
+            f"could not enumerate bottles on gateway network {network}: {detail}"
+        )
     return [
         name for name in (line.strip() for line in proc.stdout.splitlines())
         if name and name != gateway_name