WIP: Deduplicate files in local cache with or without exec rights

Valentin Davidrequested to merge
valentindavid/local-cache-exec-leak into master

Description

If we introduce an exact same object with execution rights as existing file without execution right, we should not expect that the files suddenly get execution rights. This breaks reproducibility and it is easy to encounter. For example install an empty file with execution rights. Or copy files from another artifact and chmod +x it.

This merge request, when approved, will close: #910

Edited by Valentin David

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