drop build cache scripts – use RAM-only rag

Dockerfile

@@ -11,16 +11,6 @@ WORKDIR /code
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# ---- NEW: pre-cache dataset into /code/.cache ----
-COPY cache_ds.py .
-RUN python cache_ds.py
-
-# tell HF/datasets to use the pre-cached dir (read-only at runtime)
-ENV HF_DATASETS_OFFLINE=1
-ENV HF_DATASETS_CACHE=/code/.cache
-ENV TRANSFORMERS_CACHE=/code/.cache
-ENV TRANSFORMERS_OFFLINE=1
-
 # copy app code
 COPY . .