This value isn't really that useful in the @actions/github module. It may be better to expose it in core or io, so we don't need to import the actions/github lib just to get to this value when doing file operations. The actions/github context is really just for items that you may want to use in the octokit apis, a local file path doesn't really fit in.

Thanks for the pr, but I don't think this is the correct approach. I'm going to close this out.