fix error reporting of runner

When an error is reported, container.logs() returns an iterator over
lines of bytes. The decode() function should apply to each line, not to
the iterator, otherwise we get no logs, but an error message saying
there is no decode() function in the iterator.

This change follows the same pattern as stream_logs() in the same file.

Author: tureba

ann_benchmarks/runner.py

@@ -381,7 +381,8 @@ def _handle_container_return_value(
         msg = msg.format(exit_code)
 
     if exit_code not in [0, None]:
-        logger.error(colors.color(container.logs().decode(), fg="red"))
+        for line in container.logs(stream=True):
+            logger.error(colors.color(line.decode(), fg="red"))
         logger.error(msg)
     else:
         logger.info(msg)