White Pony Express was trying to develop an app that would make it easier for grocery stores, restaurants and other small businesses to alert volunteer food runners when they had excess food that could be redistributed. So the nonprofit, which is based in Concord, applied for and received $100,000 from the Contra Costa County Innovation Fund grant. “It made a lot of things possible because we were a little bit stuck, where we had the technology, but the technology needed…