Add musl CI

Author: youknowone

.github/workflows/ci.yaml

@@ -89,8 +89,8 @@ jobs:
         with:
           target: i686-unknown-linux-gnu
 
-      - name: Install gcc-multilib
-        run: sudo apt-get update && sudo apt-get install gcc-multilib
+      - name: Install gcc-multilib and musl-tools
+        run: sudo apt-get update && sudo apt-get install gcc-multilib musl-tools
       - name: Check compilation for x86 32bit
         uses: actions-rs/cargo@v1
         with:
@@ -107,6 +107,16 @@ jobs:
           command: check
           args: --target aarch64-linux-android
 
+      - uses: actions-rs/toolchain@v1
+        with:
+          target: i686-unknown-linux-musl
+
+      - name: Check compilation for musl
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --target i686-unknown-linux-musl
+
       - uses: actions-rs/toolchain@v1
         with:
           target: wasm32-unknown-unknown