30-Day Cloud & DevOps Challenge: Day 8 — Jenkins: my First CI/CD Pipeline

Yesterday, I had all three containers running with Docker Compose; frontend, backend, and PostgreSQL. But there was still one manual step: every time I changed code, I had to rebuild and restart containers manually. Today, I fixed that forever. I installed Jenkins — an automation server that watches my GitHub repository and runs tasks automatically when code changes. This is the heart of CI/CD (Continuous Integration/Continuous Deployment). First: What is Jenkins? In one sentence: Jenkins is a t