One of Costco’s signature deals isn’t going anywhere. Gary Millerchip, chief financial officer of the wholesale chain, on Thursday addressed the future of the $1.50 hot-dog and drink deal — which has long been a staple of Costco’s food court — and vowed to keep it. He relayed the good consumer news during a quarterly earnings conference call with shareholders, according to Fox Business. Millerchip pledged to continue the business practices of his recently retired predecessor, Richard Galanti. “While I can’t promise to be able to match the humor that Richard Galanti has become famous for, I c…