fix: Add accelerate to sglang runtime image for diffusion workers (#8357)

Signed-off-by: Krishnan Prashanth <kprashanth@nvidia.com>

container/templates/sglang_runtime.Dockerfile

@@ -50,6 +50,12 @@ RUN --mount=type=cache,target=/root/.cache/pip,sharing=locked \
         /opt/dynamo/wheelhouse/ai_dynamo_runtime*.whl \
         /opt/dynamo/wheelhouse/ai_dynamo*any.whl
 
+# Install accelerate for diffusion/video worker pipelines (diffusers requires it
+# for enable_model_cpu_offload but the upstream SGLang runtime image omits it)
+RUN --mount=type=cache,target=/root/.cache/pip,sharing=locked \
+    export PIP_CACHE_DIR=/root/.cache/pip && \
+    pip install --break-system-packages --no-deps "accelerate==1.13.0"
+
 # Install gpu_memory_service wheel if enabled (all targets)
 ARG ENABLE_GPU_MEMORY_SERVICE
 RUN --mount=type=cache,target=/root/.cache/pip,sharing=locked \