Heat the olive oil in a large skillet over medium heat. Add three of the olives (reserve the others) and cook for a minute, until fragrant. Add the onion and garlic and cook for 4 minutes, until softened, stirring regularly to avoid colouring. Add the zucchini, sprinkle with salt, pepper, and herbes de Provence, and stir to combine. Cover and cook for 5 minutes.
Add the white wine and the reserved olives, and stir again. Turn the heat to medium-high and cook, uncovered, for 5 to 7 minutes, until most of the juices have evaporated. Serve hot, at room temperature, or cold.