I believe it's not a repository related problem (unless it's necessary to use a thrid-party CI service), but at the end I need to know how to build Docker images and share the same tag across them.
Right now I'm using three different rules in Docker Hub to build, tag and publish a Docker image with a connected GitHub repository (this one). Those rules are the following ones:
However, Docker Hub builder produces different images, something that can be checked with the digest codes:
Because of that, I think it's better to share the same image (and, consequently, the same digest code) when I'm building the same repo's commit.
For the moment I'm deleting the custom-tagged ones and leave only the latest-tagged one.