Dockerfile of automated build is empty

hi,

I just set up a very simple automated build project (https://hub.docker.com/r/walty8/docker-trac-dev/~/dockerfile/) in docker hub, and I linked it to my github project (https://github.com/walty8/docker-trac-dev).

The build could be triggered, and I could find the image built in the tag page. Everything seems smooth. However,the Dockerfile page remains empty even after the successful build.

Did I miss something obvious here?

Thanks a lot.

OK, I can see the file now. It seems took more than 5 hours to appear.