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Dockerhub Automated Build With Git Commit Hash

I have search and try this before i ask in this forum.
I have setup my private registry on Dockerhub, and use Build image on Dockerhub Infrastructure.
For static git branch , it is working perfectly.

But the documentation is really confusing for build an image based on git commit hash.
I know that there is build “Environment variables for building and testing”
but how to use it on Dockerhub?

My case is i want to build every commit on git branch and using git commit hash as my image tag.
Please advice

Thank You

no need to answer it guys
its solved