Ability to only check if cache exist

[roni-frantchi]

First off, thanks for this fork!
It helped us get around this issue, install our deps once in a setup job then have subsequent job/matrix use that cache.

For that use case, it would be very useful to be able to have a way to only check if the cache exist, without actually getting and expanding it.

[ktmud]

@roni-frantchi Hi, sorry for the late response. Totally missed the notifications on this one.

Can you elaborate what's the exact use case where you need to only check if the cache exist but not use it?

This should be much easier to implement now with the newly released @actions/cache npm package. I'll see what I can do to make it work.