Apply suggestion from @kasperk81

Author: kasperk81

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
         if: runner.os == 'macOS'
         run: ./build.libgit2.sh
       - name: Setup QEMU
-        if: runner.os == 'Linux'
+        if: startsWith(matrix.name, 'linux-musl-')
         run: docker run --privileged --rm tonistiigi/binfmt --install all
       - name: Build Linux
         if: runner.os == 'Linux'