DockerClientConfigUtils#getDefaultGateway() is failing with syslog driver

Hello guys,

I'm trying to use testcontainers-java (which I like a lot) and I can't make it work in my CI infrastructure.
The reason of the failure is because I'm running my tests inside docker and the docker logging driver is configured to syslog.

For what I understood, this code is trying to read the log to get the output of a command to get the gateway ip and it's failing because getting the log is not supported by syslog.
Therefore the gateway ip address can not be determined and the library can not properly manage containers.

I'm getting the following error in the logs of my build:

10:11:34.252 [tc-okhttp-stream-247575268] ERROR com.github.dockerjava.core.async.ResultCallbackTemplate - Error during callback
com.github.dockerjava.api.exception.InternalServerErrorException: {"message":"configured logging reader does not support reading"}

It looks like an issue to me as the library can not be used with such configuration. I'd like to have your thoughts on that and eventually know if there could be any workaround I could use.

Thank in advance !

core/src/main/java/org/testcontainers/dockerclient/DockerClientConfigUtils.java の getDefaultGateway() から開始し、Docker の syslog logging driver で失敗を再現します。コマンド出力と gateway IP がどのように取得されるかを追跡し、Testcontainers が未対応の logging-reader エラーなしでゲートウェイを判定できることを確認します。