Chipotle is adding cauliflower rice to its menu as customers’ tastes shift toward healthier options.Beginning Monday, the cilantro-lime flavored rice alternative will be available at all of Chipotle’s roughly 2,700 U.S. and Canada locations for a limited time. The nationwide launch follows a trial last July at 55 locations in Denver and Wisconsin that garnered favorable results, attracting new and infrequent customers.Substituting cauliflower rice in