[ROCm][CI] Fix config/test_config_generation.py (#29142)

Signed-off-by: charlifu <charlifu@amd.com>

docker/Dockerfile.rocm

@@ -7,6 +7,8 @@ FROM ${BASE_IMAGE} AS base
 
 ARG ARG_PYTORCH_ROCM_ARCH
 ENV PYTORCH_ROCM_ARCH=${ARG_PYTORCH_ROCM_ARCH:-${PYTORCH_ROCM_ARCH}}
+ENV RAY_EXPERIMENTAL_NOSET_ROCR_VISIBLE_DEVICES=1
+ENV RAY_EXPERIMENTAL_NOSET_HIP_VISIBLE_DEVICES=1
 
 # Install some basic utilities
 RUN apt-get update -q -y && apt-get install -q -y \
@@ -121,8 +123,6 @@ COPY --from=export_vllm /benchmarks ${COMMON_WORKDIR}/vllm/benchmarks
 COPY --from=export_vllm /examples ${COMMON_WORKDIR}/vllm/examples
 COPY --from=export_vllm /docker ${COMMON_WORKDIR}/vllm/docker
 
-ENV RAY_EXPERIMENTAL_NOSET_ROCR_VISIBLE_DEVICES=1
-ENV RAY_EXPERIMENTAL_NOSET_HIP_VISIBLE_DEVICES=1
 ENV TOKENIZERS_PARALLELISM=false
 
 # ENV that can improve safe tensor loading, and end-to-end time