Fix build process not refreshing core release on existing builds.
Fix build process not refreshing core release on existing builds.

If the core release was already created, we weren't always coping over
the latest files to the release directory.

NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,apinf/api-umbrella