Explicitly document how to have cache always updated.

[krpatter-intc]

Add to Readme the best-known-method for making sure you save your cache information

It would be worth spelling out in the README the details mentioned here:

https://github.com/actions/cache/issues/342#issuecomment-673371329

for how to support the ability to always work with and then update a cache

[Jamie-]

To add to this, the docs say:

3. If the job completes successfully, the action automatically creates a new cache with the contents of the path directory.

https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#example-using-the-cache-action

It does not specify that the cache is only stored on a cache miss. Confirmed in the code here: https://github.com/actions/cache/blob/main/src/save.ts#L36-L41

If the code is stay as-is, the main docs need to be updated to clarify this.

[bishal-pdMSFT]

Agree, we can probably update both README as well as the docs.

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