How to ignore a folder, and how to set rm env?

Hi,
This is a very useful GitHub action plugin, thanks for your hard work.

I got two issues when copying the artifacts to a remote machine:
1. how to ignore some folder in the source. The example only shows how to ignore a single file, and I tried to set it as below, however it does not works.
source: "folder1/,folder2/,!node_modules/"
2. I expect the target folder was removed before copying, so I would like to set rm. However, I am not sure what the value of rm should look like. A bool value, or a folder(to be removed)?

Can you please help?

Start with the existing example and the action inputs for source and rm; determine how folder exclusions and target removal are currently represented. Done means documenting the accepted values for both inputs and adding examples that answer the two usage questions.

Written by the indexing model from the issue text.