Update Dockerfile

Dockerfile

@@ -5,8 +5,13 @@ ENV PYTHONUNBUFFERED=1
 
 WORKDIR /app
 
-# system deps for some transformers backends (optional; keep minimal)
-RUN apt-get update && apt-get install -y git build-essential && rm -rf /var/lib/apt/lists/*
+# create writable cache dir and set env vars
+RUN mkdir -p /app/.cache \
+    && chown -R root:root /app/.cache
+ENV HF_HOME=/app/.cache
+ENV TRANSFORMERS_CACHE=/app/.cache
+ENV HF_DATASETS_CACHE=/app/.cache
+ENV XDG_CACHE_HOME=/app/.cache
 
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
@@ -15,5 +20,4 @@ COPY . .
 
 EXPOSE 7860
 
-# default model can be overridden via MODEL_ID env when launching
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]