This is one first class hero. A New Jersey granny with a big heart recently went viral for making a salami and cheese sandwich for her mailman — who thought it was the best thing since sliced bread. Antoinette Giancamilli, better known as  Nonna Netta , has a tradition of presenting her postman, Kyle Frankenfield, with homemade food when he delivers the mail to her Alpha, NJ home, just east of the Pennsylvania border. Antoinette Giancamilli, aka Nonna Netta, loves preparing lunch for her postman, Kyle Frankenfield. Paula Hardin “It started out when I was roasting chicken and I gave him a chicken leg,” Giancamilli, 83, told The Post. “Sometimes I just give him scones or a muffin or a piece of pizza. Whatever I have, I give him … But he loves a bagel with salami and cheese, that’s his favorite.” The viral clip, which got close to 9 million combined views, started with the octogenarian in her kitchen, putting together the Genoa salami and provolone cheese on a bagel and toasting it.…