Patch README #4

Job	Run time
build-engine (x86_64-unknown-linux-musl, linux/amd64)	7m 24s
build-engine (aarch64-unknown-linux-musl, linux/arm64)	7m 52s
docker-build (x86_64-unknown-linux-musl, linux/amd64)	27s
docker-build (aarch64-unknown-linux-musl, linux/arm64)	29s
docker-merge	12s
	16m 24s

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