implements `extension/runTask` (#261) #171

Job	Run time
x86_64-linux-musl	33s
i686-linux-musl	30s
aarch64-linux-musl	32s
x86_64-apple-darwin14	33s
aarch64-apple-darwin14	34s
x86_64-w64-mingw32	16s
i686-w32-mingw32	20s
Create a Universal macOS binary	0s
Create Github Release	0s
	3m 18s

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