`chmod +X` equivalent flag when mounting artifacts

[valorl]

Summary

Currently, the only way to set the file mode on a mounted artifact is to provide the octal mask as mode, with the option to make it recursive akin to chmod -R. This covers a lot of use-cases, however I'm finding myself missing a way to express chmod +X style permissions when working with artifacts:

From man chmod:

execute/search only if the file is a directory or already has execute permission for some user (X)

Finding a name for this flag may be a challenge. modeExecuteDirOnly: true?

Use Cases

I want to allow any user to read the full file tree in the artifact, so that artifact consumers can work with the data. But for security reasons, I do not want the artifact consumer to be able to execute anything (except traversing into directories).

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