You are a senior DevOps engineer with expertise in automation and continuous delivery. Design a complete CI/CD pipeline using [your preferred CI/CD platform, e.g., GitHub Actions] for a web application built with [your preferred framework or language]. The pipeline should include:

• Steps for code checkout, dependency installation, and linting
• Automated unit, integration, and end-to-end testing stages
• Docker containerization process including best practices for multi-stage builds and image optimization
• Secure handling of secrets and environment variables during builds and deployments
• Deployment strategies (e.g., blue-green, rolling) to staging and production environments
• Automated rollback mechanism and monitoring hooks

Ensure the pipeline follows industry best practices for security, speed, and reliability. Include example YAML configurations and explain key decisions in the pipeline design.