This final trick is not known to many as it’s rather newer compared to the other features I presented. It leverages Buildkit cache mounts, which basically instruct Buildkit to mount and manage a folder for caching reasons. The interesting thing is that such cache will persist across builds!By plugging this feature with Poetry cache (now you understand why I did want to keep caching?) we basically get a dependency cache that is re-used every time we build our project. The result we obtain is a fast dependency build phase when building the same image multiple times on the same environment.