libstore: always canonicalize directory permissions #13526
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Motivation
Prior to this patch, mode 0444 is not updated to 0555 for directories. That means for instance 0554 is canonicalized, but not 0444.
I don't believe this has any implications for backwards compatibility, because directories do not have permissions in NAR format and so are always 0555 after de-serialization, and store paths with wrong permissions can’t be copied to another host.
This patch was proposed by @roberth in #12786.
I'd love to add a unit test for this, but I saw no existing examples for code in this file.
Context
Fixes #12786.
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