Pass along GHA cache url

Author: mdboom

.github/workflows/build-wheel.yml

@@ -144,6 +144,7 @@ jobs:
             CC="/host${{ env.SCCACHE_PATH }} cc"
             CXX="/host${{ env.SCCACHE_PATH }} c++"
             SCCACHE_GHA_ENABLED=true
+            ACTIONS_CACHE_URL=${{ env.ACTIONS_CACHE_URL }}
           CIBW_ENVIRONMENT_WINDOWS: >
             CUDA_PATH="$(cygpath -w ${{ env.CUDA_PATH }})"
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}