title: Why do some of the repositories on docker hub not having dockerfile?
body: <p>When I use the repo on docker hub, I saw some of them have the corresponding docker files. E.g. <a href="https://hub.docker.com/r/limesbonn/hisat2/dockerfile" rel="nofollow noreferrer">https://hub.docker.com/r/limesbonn/hisat2/dockerfile</a></p>
  <p>But some of them don't. E.g: <a href="https://hub.docker.com/r/leanderd/single-cell-analysis" rel="nofollow noreferrer">https://hub.docker.com/r/leanderd/single-cell-analysis</a></p>
  <p>Could someone tell me why? Is there a way to get the dockerfile from a repo like this one: <a href="https://hub.docker.com/r/leanderd/single-cell-analysis" rel="nofollow noreferrer">https://hub.docker.com/r/leanderd/single-cell-analysis</a>? Thanks in advance.</p>