Secrets and 12-factor: env vs vault
12-factor config, env in dev, vault in prod.
Zero-downtime deployment: blue-green and rolling
Rolling, blue-green, health checks, graceful shutdown.
Observability: logs, metrics, alerts
Structured logging, metrics, alerting basics.
CI/CD for startups: GitLab CI and GitHub Actions
Lint, test, build, deploy, secrets management.
Docker Compose: production-like dev environment
Services, volumes, env parity, hot-reload.
