Meanwhile, heat a large skillet over medium-low heat. Add oil and garlic and cook, stirring frequently, until garlic is lightly browned, 3 to 5 minutes. Add onion and zucchini and cook, stirring frequently, until soft, about 5 minutes. Add tomatoes, olives, oregano, and red pepper flakes; season with salt to taste. Add white wine and simmer for a about 5 minutes.