feat: multi-stage build for slim image

Dockerfile

@@ -1,28 +1,27 @@
 # Use Python 3.13 slim image as base
-FROM python:3.13-slim
+FROM python:3.13-slim AS builder
 
 # Set working directory
 WORKDIR /app
 
-# Set environment variables
-ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1 \
-    POETRY_NO_INTERACTION=1 \
-    POETRY_VENV_IN_PROJECT=1 \
-    POETRY_CACHE_DIR=/tmp/poetry_cache
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y \
-    build-essential \
-    curl \
-    && rm -rf /var/lib/apt/lists/*
+# # Install system dependencies
+# RUN apt-get update && apt-get install -y \
+#     build-essential \
+#     curl \
+#     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements file
 COPY requirements.txt .
 
 # Install Python dependencies
-RUN pip install --no-cache-dir --upgrade pip && \
-    pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir --no-deps \
+    --disable-pip-version-check \
+    --target=/app/site-packages \
+    -r requirements.txt
+
+FROM python:3.13-slim
+
+COPY --from=builder /app/site-packages /app/site-packages
 
 # Create a non-root user
 RUN adduser --disabled-password --gecos '' appuser
@@ -31,8 +30,11 @@ RUN adduser --disabled-password --gecos '' appuser
 COPY ./app /app/app
 COPY ./generate_math_exercises.py /app/
 
-# Change ownership of the app directory to the non-root user
-RUN chown -R appuser:appuser /app
+ENV PYTHONPATH=/app/site-packages
+ENV PATH=/app/site-packages/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+# Set working directory
+WORKDIR /app
 
 # Switch to non-root user
 USER appuser
@@ -40,9 +42,5 @@ USER appuser
 # Expose port
 EXPOSE 8000
 
-# Health check
-HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost:8000/health || exit 1
-
 # Run the application
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]