refactor: Optimize Docker build with a multi-stage process and switch docker-compose to use a pre-built image.

Dockerfile

@@ -1,25 +1,35 @@
-FROM python:3.12-slim AS base
+# --- Build stage ---
+FROM python:3.12-slim AS builder
 
-# Install uv
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 
 WORKDIR /app
 
-# Copy dependency files first for better layer caching
+# Enable bytecode compilation for faster startup
+ENV UV_COMPILE_BYTECODE=1
+# Use copy mode (no hardlinks in containers)
+ENV UV_LINK_MODE=copy
+
+# Install dependencies first (cached if pyproject.toml unchanged)
 COPY pyproject.toml uv.lock* ./
+RUN uv sync --no-dev --no-install-project --frozen
 
-# Install dependencies
-RUN uv sync --no-dev --no-install-project
-
-# Copy source code
+# Copy source and install project
 COPY src/ ./src/
+RUN uv sync --no-dev --frozen
 
-# Install the project itself
-RUN uv sync --no-dev
+# --- Runtime stage ---
+FROM python:3.12-slim
 
-# Create data directory
-RUN mkdir -p /app/data
+WORKDIR /app
 
+# Copy the entire venv and project from builder
+COPY --from=builder /app /app
+
+# Add venv to PATH so we don't need uv at runtime
+ENV PATH="/app/.venv/bin:$PATH"
 ENV DATA_DIR=/app/data
 
-CMD ["uv", "run", "python", "-m", "src.main"]
+RUN mkdir -p /app/data
+
+CMD ["rss-bot"]