Fix cache permissions: Set HF cache to /tmp for Docker container

- Add HF_HOME, TRANSFORMERS_CACHE env vars
- Resolves PermissionError at /.cache
- Models will download to /tmp/huggingface (writable)

Dockerfile

@@ -4,6 +4,11 @@ FROM python:3.10-slim
 # Set working directory
 WORKDIR /app
 
+# Set environment variables for Hugging Face cache
+ENV HF_HOME=/tmp/huggingface
+ENV TRANSFORMERS_CACHE=/tmp/huggingface/transformers
+ENV HF_DATASETS_CACHE=/tmp/huggingface/datasets
+
 # Install system dependencies
 RUN apt-get update && apt-get install -y \
     build-essential \