Dear Filipe,
sorry I did not explaing the use case, obiously this is a toy example to show my problem.
So I have pipeline, that from a repository generate a tar file, using a python script; if the hash of the tar file is different it will trigger other things.
As you can imagine each time the pipeline is run, the content is the same (if same commit) but the files timestamps are different and so the tar is different.

Thanks for pointing out that examples, I will check and let you know.

Thanks