add linux-armv7l-musl and linux-armv6l-musl prebuilts

[chrisns]

implements https://github.com/serialport/bindings-cpp/issues/139#issuecomment-1822452616 suggestion from @alexojegu 🤞 hopefully this can fix some of the issues we've got with bundling zwave-js cc @robertsLando https://github.com/zwave-js/zwave-js-ui/pull/3440