Request: specify local directory

I see we can specify the destination directory. Would you consider also adding a parameter for the `local` directory too? I see you are copying ` $GITHUB_WORKSPACE/` but I only want to copy a subdirectory over.

Thanks!

Start at the GitHub Actions entry point that handles the existing destination directory and the `$GITHUB_WORKSPACE/` source. Trace how the source path is passed to rsync, then verify that a configurable local subdirectory can be selected without changing the destination behavior.

Written by the indexing model from the issue text.