feat: Use exec to replace current shell with the Kafka process (as …

…ENTRYPOINT) (#1282)

src/Testcontainers.Kafka/KafkaBuilder.cs

@@ -83,7 +83,7 @@ protected override KafkaBuilder Init()
  startupScript.Append(lf);
  startupScript.Append("echo '' > /etc/confluent/docker/ensure");
  startupScript.Append(lf);
- startupScript.Append("/etc/confluent/docker/run");
+ startupScript.Append("exec /etc/confluent/docker/run");
  return container.CopyAsync(Encoding.Default.GetBytes(startupScript.ToString()), StartupScriptFilePath, Unix.FileMode755, ct);
  });
  }