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I have lived in Africa for at least half of my life, and I have seen local people producing excellent roofed structures.
If this was me doing this I would go to the local villagers and ask them to help in building a shade roof using local materials and know how. If you can use thatch it will be cooler than any modern materials, and the villagers will be able to maintain it for years to come. If this container is be there for some considerable time I would plant a few local trees (fast growing) around it as well.