Image build is optimized.

flask_ml_api/Dockerfile

@@ -5,6 +5,7 @@ FROM python:3.10-slim AS builder
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     python3-venv \
+    && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
 # Create and activate virtual environment