Dockerfile Provider - Git or URL support

[Salvoxia]

Description

Hi,

I discovered DIUN while searching for a way to keep me informed when a base image I use in any of my custom Docker images gets updated. The Dockerfile provider seems to be made for exactly that.
I discovered this old issue outlining what it was planned to be able to do, and it lists the possibility to scan Git repos for Dockerfiles, which is exactly what I was looking for. However, after reading the documentation and playing around with it, it seems that specific functionality did not make it into the actual implemention.

Any chance of adding that handy feature?
I would also be happy if it was possible to provide an URL instead of a local path. That way I could link to the raw Dockerfile on Github/Gitlab/Gitea/whatever.

Thanks!

Best Regards,
Salvoxia