Document limitation

[adrianjost]

I've run into the following limitation of this extension and invested way more time than I should have to figure out that this package can not be used to retrieve values from previous workflow runs.

Github states:

You can only download artifacts that were uploaded during the same workflow run.
https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts#:~:text=You%20can%20only%20download%20artifacts%20that%20were%20uploaded%20during%20the%20same%20workflow%20run.

Would be nice if this would be prominently documented. However I don't know what the use-case of this project then is. 🤷‍♂️