Add a cross-check for aarch64-unknown-linux-musl in CI.

Author: sunfishcode

.github/workflows/main.yml

@@ -63,6 +63,7 @@ jobs:
         wasm32-unknown-emscripten
         riscv64gc-unknown-linux-gnu
         aarch64-unknown-linux-gnu
+        aarch64-unknown-linux-musl
         armv5te-unknown-linux-gnueabi
     - name: Install cross-compilation tools
       run: |
@@ -84,6 +85,7 @@ jobs:
     - run: cargo check --workspace --release -vv --target=wasm32-unknown-emscripten
     - run: cargo check --workspace --release -vv --target=riscv64gc-unknown-linux-gnu
     - run: cargo check --workspace --release -vv --target=aarch64-unknown-linux-gnu
+    - run: cargo check --workspace --release -vv --target=aarch64-unknown-linux-musl
     - run: cargo check --workspace --release -vv --target=armv5te-unknown-linux-gnueabi
 
   check_no_default_features: