update `Dockerfile` to use OLLAMA_HOST

Dockerfile

@@ -13,4 +13,5 @@ ARG GROUP=ollama
 RUN addgroup -g 1000 $GROUP && adduser -u 1000 -DG $GROUP $USER
 USER $USER:$GROUP
 ENTRYPOINT ["/bin/ollama"]
+ENV OLLAMA_HOST 0.0.0.0
 CMD ["serve"]