Workflow secrets should only be usable by direct name

[klassiker]

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The recent worm on npm used toJSON(secrets) in it's persisting workflow.

Would it be possible to prohibit direct access to the full object?
Is there any legitimate use for accessing the entire secrets object?

I would imagine everyone references secrets by name.

This would make such an attack harder, requiring an attacker to first collect all secret names that are actively in use based on the actual workflows. Currently, even unused secrets would be extracted this way.

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