test loongson[64] support

[mcandre]

• [x] factorio
• [ ] tug (Docker buildx appears to currently lack support for loongson[64])
• [ ] crit
• [ ] snek

[mcandre]

tug can't loongson until buildx loongsons and Docker Hub image maintainers en masse add support for the architecture.

crit can't loongson until cross images support it.

snek can't loongson until prominent OS distribution builds of gcc and g++ support it.