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In my own experience, MSF would build pharmacies with high roofs and ceilings with ventilation near the top - barred windows (and meshed against bats). With corrugated iron roofs they also had a reinforcing bar cage below the ceiling to prevent people prising open the roof to get at the drugs. A good overhang of roof, to prevent direct sunlight coming into the windows also helps. Ventilation above the ceiling at either end (again meshed) keeps down the temperature above the ceiling. A light colour for external walls would help.
A container would work with a grass roof above it to insulate - again a good gap between the container roof and the grass roof with plenty of overhang.