[Docker] Expose bundled vllm-rs on PATH (#57606)

Signed-off-by: Alec Flowers <aflowers@nvidia.com>
Signed-off-by: Alec <35311602+alec-flowers@users.noreply.github.com>
Co-authored-by: Codex <noreply@openai.com>
Co-authored-by: Bugen Zhao <i@bugenzhao.com>

docker/Dockerfile

@@ -1063,6 +1063,10 @@ RUN --mount=type=bind,from=build,src=/workspace/dist,target=/vllm-workspace/dist
         --extra-index-url ${PYTORCH_CUDA_INDEX_BASE_URL}/cu$(echo $CUDA_VERSION | cut -d. -f1,2 | tr -d '.'); \
     fi
 
+# Expose the Rust frontend bundled in the wheel on the container's PATH.
+RUN ln -s "$(python3 -c 'import sysconfig; print(sysconfig.get_path("platlib"))')/vllm/vllm-rs" /usr/local/bin/vllm-rs \
+    && vllm-rs --version
+
 RUN --mount=type=cache,target=/opt/uv/cache \
 . /etc/environment && \
 uv pip list