Jelly Roll and Dunkin Donuts are a match made in heaven with a sweet new collaboration just in time for National Donut Day on Friday (June 7). The country singer and the breakfast chain shared a promotional video on social media in preparation for the big day. “You know everyone always asks me how I got the name Jelly Roll,” he starts as he helps himself to a jelly-filled donut. “Believe it or not, the truth is, it’s ’cause of these little guys right here.” “Y’all know growin up donuts were truly my kryptonite,” he continues. “My mama used to tell me all the time that I was so sweet I could op…