Fig and Mustard Baby Back Ribs

Name: Fig and Mustard Baby Back Ribs
Ingredients: 1 Tbsp. Diamond Crystal or 1¾ tsp. Morton kosher salt; 1 Tbsp. herbes de Provence; 1 Tbsp. light brown sugar; 2 tsp. onion powder; 1 tsp. garlic powder; 2 racks baby back pork ribs (3–4 lb. total); 1 Tbsp. vegetable oil, plus more for grill; 1 medium red onion, finely chopped; 4 garlic cloves, finely chopped; 1 cup fig jam; ½ cup apple cider vinegar; ½ cup spicy brown mustard; ¼ cup (packed) light brown sugar; 2 Tbsp. finely chopped canned chipotle chiles in adobo; 1 Tbsp. Worcestershire sauce; Kosher salt, freshly ground pepper