Fix: Add execute permissions to download_models.py

Dockerfile

@@ -52,6 +52,7 @@ RUN python3 -m venv /opt/mineru_venv && \
 USER user
 RUN . /opt/mineru_venv/bin/activate && \
     wget https://github.com/opendatalab/MinerU/raw/master/scripts/download_models_hf.py -O download_models.py && \
+    chmod +x download_models.py && \
     python3 download_models.py && \
     wget https://github.com/opendatalab/MinerU/raw/master/magic-pdf.template.json -O $HOME/magic-pdf.json && \
     sed -i 's|"device": "cpu"|"device": "cpu"|g' $HOME/magic-pdf.json