fix: move the GRPC cache generation workflow into it's own concurrenc… #804

Job	Run time
build-linux (avx2)	11m 8s
build-macOS (avx2)	33m 5s
build-linux (avx, -DLLAMA_AVX2=OFF)	11m 7s
build-macOS-arm64 (avx2)	8m 53s
build-macOS (avx, -DLLAMA_AVX2=OFF)	16m 34s
build-linux (avx512, -DLLAMA_AVX512=ON)	11m 10s
build-macOS-arm64 (avx, -DLLAMA_AVX2=OFF)	8m 53s
build-macOS (avx512, -DLLAMA_AVX512=ON)	18m 17s
build-linux (cuda12)	19m 14s
build-macOS-arm64 (avx512, -DLLAMA_AVX512=ON)	8m 35s
build-linux (cuda11)	15m 27s
build-stablediffusion	4m 7s
	2h 46m 30s

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