Try manually install target

Author: AntoniosBarotsis

Diff for: .github/workflows/ci.yml

@@ -100,6 +100,9 @@ jobs:
       with:
         toolchain: ${{ matrix.rust }}
         targets: x86_64-unknown-linux-musl
+    
+    - name: Manually install target
+      run: rustup target add x86_64-unknown-linux-musl
 
     - name: Setup MUSL
       run: |