ci: narrow builds to macos metal, windows vulkan, ubuntu avx512 #4

Job	Run time
windows-latest-cmake (vulkan, -DSD_VULKAN=ON -DSD_BUILD_SHARED_LIBS=ON)	3m 20s
macOS-latest-cmake (metal, -DGGML_AVX2=ON -DSD_METAL=ON -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" ...	3m 36s
ubuntu-latest-cmake (avx512, -DGGML_NATIVE=OFF -DGGML_AVX512=ON -DGGML_AVX=ON -DGGML_AVX2=ON -DGG...	3m 8s
windows-latest-cmake-hip	3m 35s
release	1s
	13m 40s

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