public long Docker(string image, string command, out string stdout, out string stderr)
{
var container = getContainer(image);
if (container == null)
{
stdout = "";
stderr = $"cannot create a container of image `{image}`";
return(-2);
}
logger.LogInformation($"execute in {container}({image}): {command}");
var tsk = docker.RunCommandInContainerAsync(container,
command, timeout);
tsk.Wait();
stdout = tsk.Result.stdout;
stderr = tsk.Result.stderr;
return(tsk.Result.exitCode);
}