Suzanne Griffin has a story to tell her 5-month-old-daughter, Elizabeth, when she grows up. Griffin bundled Elizabeth in a baby carrier, protecting her from the sun and then from drenching rain, as they stood with a group of onlookers hoping to meet action movie star Dwayne “The Rock” Johnson. Griffin was one of about a dozen gawkers who braved the weather late Monday afternoon at Prior Street near Brenau University, where the muscular leading man has been shooting scenes for his new movie — “Rampage.”