feat: adding new skills, including testing patterns and methodologies, along with bundled resources for better usability.

.claude/skills/devops/docker/templates/Dockerfile.python

@@ -0,0 +1,78 @@
+# =============================================================================
+# Multi-Stage Python Dockerfile
+# Usage:
+#   docker build -t myapp .
+#   docker run -p 8000:8000 myapp
+# =============================================================================
+
+# ---------------------------------------------------------------------------
+# Stage 1: Build dependencies
+# ---------------------------------------------------------------------------
+# Use slim for building - it has gcc and headers available via apt.
+FROM python:3.12-slim AS builder
+
+# Prevent Python from writing .pyc files and enable unbuffered output.
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+# Install build-time system dependencies (if any compiled packages need them).
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Install Python dependencies into a virtual environment.
+# Copying requirements first enables Docker layer caching --
+# dependencies are only reinstalled when requirements.txt changes.
+COPY requirements.txt .
+RUN python -m venv /app/.venv \
+    && /app/.venv/bin/pip install --no-cache-dir --upgrade pip \
+    && /app/.venv/bin/pip install --no-cache-dir -r requirements.txt
+
+# ---------------------------------------------------------------------------
+# Stage 2: Runtime
+# ---------------------------------------------------------------------------
+FROM python:3.12-slim AS runtime
+
+# Prevent .pyc files and enable unbuffered output for logging.
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PATH="/app/.venv/bin:$PATH"
+
+# Install only runtime system dependencies (no build tools).
+# Add packages here if your app needs them at runtime (e.g., libpq for psycopg).
+# RUN apt-get update && apt-get install -y --no-install-recommends \
+#     libpq5 \
+#     && rm -rf /var/lib/apt/lists/*
+
+# Create a non-root user for security.
+RUN groupadd -r appuser && useradd -r -g appuser -d /app -s /bin/false appuser
+
+WORKDIR /app
+
+# Copy the virtual environment from the builder stage.
+COPY --from=builder /app/.venv /app/.venv
+
+# Copy application source code.
+COPY src/ ./src/
+
+# Switch to non-root user.
+USER appuser
+
+# Expose the application port.
+EXPOSE 8000
+
+# Health check -- adjust the endpoint to match your app.
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || exit 1
+
+# Run the application.
+# For FastAPI/Uvicorn:
+CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8000"]
+
+# For Django/Gunicorn:
+# CMD ["gunicorn", "src.wsgi:application", "--bind", "0.0.0.0:8000", "--workers", "4"]
+
+# For a plain script:
+# CMD ["python", "-m", "src.main"]