Instant Pot Turkey Gravy

Name: Instant Pot Turkey Gravy
Ingredients: 1 stick unsalted butter; 3/4 cup all-purpose flour; 7 cups Instant Pot® Turkey Stock, warm, plus more if needed, recipe follows; Kosher salt and freshly ground black pepper; 2 to 3 tablespoons canola oil; 3 turkey wings (about 3 pounds) cut into 2 pieces at the drumette joint; 1 turkey neck (or another turkey wing); 4 large cloves garlic, peeled; 2 stalks celery, cut in half crosswise; 1 medium carrot, cut in half crosswise; 1/2 large onion; 5 fresh sage leaves; 3 bay leaves; 2 small sprigs (or 1 large) fresh rosemary; 2 sprigs fresh thyme; 2 teaspoons black peppercorns; Kosher salt