Install musl-tools in CI

Author: Heliozoa

.github/workflows/upload-binaries.yml

@@ -50,6 +50,9 @@ jobs:
       - name: Install armv7-unknown-linux-gnueabihf linker
         if: ${{ matrix.target == 'armv7-unknown-linux-gnueabihf' }}
         run: sudo apt install -y gcc-arm-linux-gnueabihf
+      - name: Install musl gcc
+        if: ${{ matrix.target == 'x86_64-unknown-linux-musl' }}
+        run: sudo apt install -y musl-tools
 
       - name: Build
         run: |