ci: quote TORCH_CUDA_ARCH_LIST in CIBW_ENVIRONMENT (bashlex ; parse)

Author: GeophyAI

.github/workflows/wheels.yml

@@ -56,9 +56,12 @@ jobs:
           # Install the CUDA 12.8 toolkit (nvcc + cudart headers) into the build
           # container once. Script lives in .github/ (scripts/ is .gitignore'd).
           CIBW_BEFORE_ALL_LINUX: bash {project}/.github/install_cuda_el8.sh 12-8
+          # NB: quote the arch list — cibuildwheel parses CIBW_ENVIRONMENT with
+          # bashlex, so unquoted ';' would be read as a command separator and
+          # error out ("Malformed environment") before any build starts.
           CIBW_ENVIRONMENT_LINUX: >
             SWEEP_BUILD_CUDA=1
-            TORCH_CUDA_ARCH_LIST=7.0;7.5;8.0;8.6;8.9;9.0
+            TORCH_CUDA_ARCH_LIST="7.0;7.5;8.0;8.6;8.9;9.0"
             CUDA_HOME=/usr/local/cuda
             PATH=/usr/local/cuda/bin:$PATH
           # Build against the exact torch users resolve at install time.