Puree first 9 ingredients in a blender; stir in beer. In a 5- or 6-qt. slow cooker, combine pork and pineapple mixture. Cook, covered, on low until pork is very tender, 6-8 hours. Stir to break up pork. , Stir cilantro into salsa. Using a slotted spoon, serve pork mixture in tortillas; add salsa and toppings as desired.