That's expected, you need to download the prebuilt shaders for vulkan or build them yourself. There should be a script for it https://gitea.wildfiregames.com/0ad/0ad/src/branch/main/source/tools/spirv/get-nightly-shaders.sh
There is a theory that the Trojan Horse was a battering ram, and that the works of Homer reflect his time period at times rather than the period the stories take place, so I suppose an Archaic Greek battering ram is not inconceivable.