Fix cibuildwheel environment for macOS/Windows

Use cibuildwheel's {project} placeholder instead of ${{ github.workspace }}
to ensure correct path expansion for CMAKE_PREFIX_PATH on all platforms.

Author: jeongseok-meta

.github/workflows/cibuildwheel.yml

@@ -59,9 +59,10 @@ jobs:
         uses: pypa/cibuildwheel@v2.22.0
         # Configuration is in pyproject.toml (generated from pyproject-pypi.toml.j2)
         env:
-          # Override environment for macOS/Windows to use absolute path
-          CIBW_ENVIRONMENT_MACOS: CMAKE_PREFIX_PATH=${{ github.workspace }}/.pixi/envs/default MOMENTUM_BUILD_WITH_FBXSDK=OFF
-          CIBW_ENVIRONMENT_WINDOWS: CMAKE_PREFIX_PATH=${{ github.workspace }}/.pixi/envs/default MOMENTUM_BUILD_WITH_FBXSDK=OFF
+          # Override environment for macOS/Windows to use cibuildwheel's {project} placeholder
+          # {project} expands to the project directory path at build time
+          CIBW_ENVIRONMENT_MACOS: "CMAKE_PREFIX_PATH={project}/.pixi/envs/default MOMENTUM_BUILD_WITH_FBXSDK=OFF"
+          CIBW_ENVIRONMENT_WINDOWS: "CMAKE_PREFIX_PATH={project}/.pixi/envs/default MOMENTUM_BUILD_WITH_FBXSDK=OFF"
 
       - uses: actions/upload-artifact@v4
         with: