CCCL source: catch2_test_device_copy_batched.cu (error handling pattern)
CCCL uses try/catch(std::bad_alloc) around all device operations.
Our patch_ops.sh had no error handling on pip install — if Docker
build network is restricted, pip fails → RUN fails → no image built.
Fix: chain pip install with fallback mirrors and skip-on-failure.
If transformers is already in the base image, this is a no-op.
a667d2e914