Detect new *-alpine-linux-musl targets (#213) #410

Job	Run time
Rustfmt	16s
Test (x86_64-unknown-linux-gnu, stable, ubuntu-latest)	6m 39s
Test (x86_64-unknown-linux-gnu, beta, ubuntu-latest)	6m 44s
Test (x86_64-unknown-linux-gnu, nightly, ubuntu-latest)	8m 8s
Test (x86_64-apple-darwin, stable, macos-latest)	5m 44s
Test (aarch64-apple-darwin, nightly, macos-latest)	4m 4s
Test (i686-unknown-linux-gnu, stable, ubuntu-latest)	3m 53s
Test (arm-unknown-linux-gnueabi, stable, ubuntu-latest)	4m 11s
Test (aarch64-unknown-linux-gnu, stable, ubuntu-latest)	4m 58s
Test (x86_64-unknown-linux-musl, stable, ubuntu-latest)	4m 20s
Test (x86_64-pc-windows-gnu, stable, ubuntu-latest)	6m 18s
Test (wasm32-wasi, stable, ubuntu-latest)	3m 37s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019)	17m 27s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2019, yes)	22m 53s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest)	24m 10s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, yes)	25m 55s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, installed)	24m 31s
	2h 53m 48s

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