Fix Windows before-build to use bash syntax (cibuildwheel uses bash on Windows)

Author: jeongseok-meta

pyproject-pypi.toml.j2

@@ -277,9 +277,10 @@ environment = { MOMENTUM_BUILD_WITH_FBXSDK = "OFF" }
 # Disable build isolation to ensure CMAKE_PREFIX_PATH is properly passed to CMake
 build-frontend = "pip; args: --no-build-isolation"
 # Install build dependencies before building (since we disabled build isolation)
+# Note: cibuildwheel runs before-build scripts in bash even on Windows, so use bash syntax
 before-build = """
-echo Debug: CMAKE_PREFIX_PATH=%CMAKE_PREFIX_PATH%
-dir %CMAKE_PREFIX_PATH%\\Library\\lib\\cmake\\Ceres 2>nul || echo Ceres cmake dir not found
+echo "Debug: CMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH"
+ls -la "$CMAKE_PREFIX_PATH/Library/lib/cmake/Ceres" 2>/dev/null || echo "Ceres cmake dir not found"
 pip install scikit-build-core pybind11 setuptools-scm
 pip install "torch>=2.8.0,<2.9" --index-url https://download.pytorch.org/whl/cpu
 """