support building for musl #48

Job	Run time
Build and test / Generate build matrix	1s
Build and test / Build source distribution	15s
Build and test / build-and-test-binary (ubuntu-latest, 3.8, x64, x86_64, true, false, _workflow_maturin_binary_0)	1m 4s
Build and test / build-and-test-binary (ubuntu-latest, 3.8, x64, aarch64, false, quay.io/pypa/manylinux_2_28_aarch...	2m 13s
Build and test / build-and-test-binary (ubuntu-latest, 3.8, x64, armv7, false, false, _workflow_maturin_binary_2)	1m 35s
Build and test / build-and-test-binary (ubuntu-latest, 3.8, x64, x86_64-unknown-linux-musl, false, quay.io/pypa/mu...	1m 24s
Build and test / build-and-test-binary (ubuntu-latest, 3.8, x64, aarch64-unknown-linux-musl, false, quay.io/pypa/m...	1m 27s
Build and test / build-and-test-binary (macos-latest, 3.8, arm64, universal2-apple-darwin, true, false, _workflow_...	1m 8s
Build and test / build-and-test-binary (windows-latest, 3.8, x64, x64, true, false, _workflow_maturin_binary_6)	1m 52s
Build and test / build-and-test-binary (windows-latest, 3.8, x86, x86, true, false, _workflow_maturin_binary_7)	3m 8s
Build and test / merge-artifacts	5s
Test distribution (ubuntu-latest)	18s
Test distribution (macos-latest)	8s
Test distribution (windows-latest)	23s
	15m 1s

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