Set HF_HOME environment variable for caching in Dockerfile

Dockerfile

@@ -12,6 +12,7 @@ RUN apt-get update && apt-get install -y \
 
 # Copy requirements first to leverage Docker cache
 COPY requirements.txt .
+ENV HF_HOME="/tmp/poetica-cache"
 
 # Install Python dependencies
 RUN pip install --no-cache-dir -r requirements.txt