Potato Gnocchi with Pork Ragu

Name: Potato Gnocchi with Pork Ragu
Ingredients: 3 tbsp. extra-virgin olive oil; 1 small yellow onion, peeled and diced; 1 small carrot, peeled and diced; 1 stalk celery, diced; 1 lb. ground pork; Kosher salt and freshly ground black pepper; 1 cup whole milk; 1 cup dry white wine; 2 cups canned whole peeled San Marzano tomatoes, juices reserved; 1 tbsp. tomato paste; Freshly grated Parmigiano-Reggiano, for topping; 1½ lb. Yukon Gold potatoes, scrubbed; ¾–1¼ cups all purpose flour, plus more for dusting; Kosher salt