moved file mod before the user change

Dockerfile

@@ -1,6 +1,12 @@
 # Base: official vLLM OpenAI-compatible server (tested version family)
 FROM vllm/vllm-openai:v0.9.1
 
+# vLLM needs the custom model to be registered before main() runs.
+# The model authors recommend importing their vLLM adapter into the vllm CLI module.
+# Do this as root before switching to user
+RUN sed -i '/^from vllm\.entrypoints\.cli\.main import main$/a\
+from DotsOCR import modeling_dots_ocr_vllm' $(which vllm)
+
 # Set up a new user named "user" with user ID 1000
 RUN useradd -m -u 1000 user
 
@@ -51,10 +57,6 @@ RUN HF_MODEL_PATH=$(cat /home/user/app/model_path.txt) && \
 ENV HF_MODEL_PATH=/home/user/.cache/huggingface/hub/models--rednote-hilab--dots.ocr
 ENV PYTHONPATH="/home/user/.cache/huggingface/hub/models--rednote-hilab--dots.ocr:${PYTHONPATH}"
 
-# vLLM needs the custom model to be registered before main() runs.
-# The model authors recommend importing their vLLM adapter into the vllm CLI module.
-RUN sed -i '/^from vllm\.entrypoints\.cli\.main import main$/a\
-from DotsOCR import modeling_dots_ocr_vllm' $(which vllm)
 
 # Expose the Space port and launch the OpenAI-compatible server
 EXPOSE 7860