Feature request: Make cache size an output of the save cache action.

[smolkaj]

It would be very useful to provide the cache size, which is already shown in the log, as an output of the save cache action.

My use case is that I would like to invoke a sort of garbage collection if the cache size gets to big.

[github-actions[bot]]

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[smolkaj]

This would still be extremely useful to have! Would this be easy to support?