add sulfur to dumpable resources by stacker

I already prepared a complete dump area for sulfur with a stacker, when I found out the stacker cannot dump sulfur.

Sulfur is Insolubility in Water: Sulfur is not water-soluble, meaning it will not dissolve or wash away during rainfall. This property eliminates concerns about environmental degradation due to dumping.
Sulfur is Non-Volatile and Stable: Sulfur does not disperse into the air or water easily, making it suitable for temporary outdoor storage.
Real world examples: Fort McMurray, Alberta Example: Massive sulfur stockpiles exist in Fort McMurray, where it is stored directly on the ground in large quantities without significant adverse effects. This precedent showcases the viability of handling sulfur in this manner, providing real-world inspiration for game mechanics.
Google "Fort McMurray Sulfur Pyramid" and any COI captain would be impressed.
angle of repose should be 30-40 degrees.