Point docker hub image tag with github

Dear all,

Sorry if i questions was dumb or lack of knowledge

i have a docker image build using a tool and published on github. i have the guys dockerhub repository URL and able to see docker file.

COPY dir:2b325cd0d91bcb80f0d699 … usr/share/nginx/html

same with

COPY file…

say he tagged a release in 1.0 in dockerhub i searched for the same release tag in github too. but not in success.

does any one knows how to back track dockerhub repository to source through github.

Thanks for reading this
prasanth