Update Dockerfile

Dockerfile

@@ -6,6 +6,11 @@ ENV PIP_NO_CACHE_DIR=1 \
     EMBED_MODEL=Seznam/simcse-small-e-czech \
     MIN_TOPIC_SIZE=10 \
     MAX_DOCS=5000
+    # ----- writable Hugging Face caches -----
+ENV HF_HOME=/tmp/hfcache \
+    TRANSFORMERS_CACHE=/tmp/hfcache \
+    SENTENCE_TRANSFORMERS_HOME=/tmp/hfcache
+RUN mkdir -p /tmp/hfcache
 
 # ---------- numba cache fix ----------
 ENV NUMBA_CACHE_DIR=/tmp/numba_cache