Support some form of "read only cache" or "centralized cache"

[ramblingenzyme]

Description:
@actions/cache now ships @actions/cache/save and @actions/cache/restore actions to easily implement different caching strategies. One of the strategies they document is "Make cache read only / Reuse cache from centralized job", where you only restore in jobs.

Justification:
It'd be nice to support this caching strategy / others in the future in this action natively to allow users to easily adopt or test strategies without having to opt out of this action's caching and implementing them themself.

Are you willing to submit a PR?
If I can find time

[priya-kinthali]

Hello @ramblingenzyme 👋,
Thank you for reporting this feature request. We will investigate it and get back to you as soon as we have some feedback.

[wouterds]

This would be nice, I have a couple of workflows running on self hosted runners that should be allowed to consume cache, but ideally I'd like to avoid the post action as it takes long and is not needed on those specific workflows.