Kill XProtect in CI

Hopefully this fixes the issue with `hdiutil` during the creation of the
disk image. Other projects such as OBS use the same workaround for now.

See actions/runner-images#7522

.github/workflows/build.yml

@@ -146,6 +146,13 @@ jobs:
     - name: Build Mixxx
       run: cmake --build build --target mixxx
       working-directory: mixxx
+    - name: Kill XProtect to work around actions/runner-images#7522
+      if: runner.os == 'macOS'
+      run: |
+        # TODO: Replace this with a better solution
+        # See https://github.com/actions/runner-images/issues/7522
+        echo Killing...; sudo pkill -9 XProtect >/dev/null || true;
+        echo Waiting...; while pgrep XProtect; do sleep 3; done;
     - name: Package Mixxx
       run: cpack -G ${{ matrix.cpack_generator }} -V && mv *.${{ matrix.package_extension }} "mixxx-${{ matrix.triplet }}-${{ env.mixxx_version }}.${{ matrix.package_extension }}"
       working-directory: mixxx/build