[bug#59749] Please add minetest-oneblock

[Vivien Kraus]

Dear guix,

oneblock is a Minetest mod where you sit on top of an indestructible
block that generates random objects of the game every 30 seconds. It is
very fun to play, especially when you have many many mods. It’s slow to
start, because getting wood is rare enough that making a chest takes
time. Other than that, it is pretty fun!

Best regards,

Vivien