Fix Empty Cache save when the path is github workspace directory #1132
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This PR fixes the #833 issue in actions/cache.
Issue Summary: Cache being saved is empty in case of path being current directory or github.workspace. So github.workspace directory can never get cached.
Root cause: The resolvePaths function returns empty since the relative path of the path provided in cache's path param is calculated against the workspace directory itself.
Resolution: We manually add '.' to paths list since the list will be empty in the above scenario.
Feedback is welcome regarding the implementation and possible alternatives. 👀