[docker hub] search by image checksum sha256

[monperrus]

Add support for searching images by sha256 (long or short)
For instance: https://hub.docker.com/search?q=e9f3cec3b8f7

Which service(s) is this request for?
Software supply chain analysis

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
In the context of software supply chain analysis, I need a way to trace from a docker image to an entry on dockerhub.
For that, we search by image checksum sha256

https://hub.docker.com/search?q=e9f3cec3b8f7

Are you currently working around the issue?
N-A

[noncommunicado]

+1