Optimize image size with multi-stage build

Author: Lekuruu

Dockerfile

@@ -1,9 +1,9 @@
-FROM python:3.13-slim-bookworm
+FROM python:3.13-slim-bookworm AS builder
 
-# Installing/Updating system dependencies
+# Installing build dependencies
 RUN apt update -y && \
     apt install -y --no-install-recommends  \
-    postgresql git curl \
+    postgresql-client git curl \
     && rm -rf /var/lib/apt/lists/*
 
 # Install rust toolchain
@@ -14,12 +14,21 @@ WORKDIR /bot
 
 # Install python dependencies
 COPY requirements.txt ./
-RUN pip install -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+FROM python:3.13-slim-bookworm
+
+# Copy installed Python packages from builder
+COPY --from=builder /usr/local /usr/local
 
 # Disable output buffering
 ENV PYTHONUNBUFFERED=1
 
 # Copy source code
 COPY . .
 
+# Generate __pycache__ directories
+ENV PYTHONDONTWRITEBYTECODE=1
+RUN python -m compileall -q app
+
 CMD ["python3", "main.py"]