The Forgejo instance completed the echo test successfully, there must
be a log at some point. But since Forgejo is still running, it may not
had time to write the logs just yet. Retry instead of giving up
immediately.
The log path depends on the previous actions run and may not always
be 01/1.log.zst. Assuming it is makes this test fragile as it is
influenced by which previous tests are run and what they do.