🧪 Basic Pipeline

1. Build Strategy Options: there are two main ways to build Docker images in GitLab CI:
   • Option A: Docker-in-Docker (DinD)
     • Requires privileged: true.
     • Enables full Docker commands inside a container.
     • More self-contained but slower and more complex.
   • Option B: Test in default container and split Jobs
     • login_job – performs Docker login.
     • build_job – builds and tags the image.
     • push_job – pushes to registry.
       • Use cache: to persist login credentials between jobs.

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           cache:
           key: docker-login
           paths:
               - ~/.docker/config.json
         

   • Automatically triggered by:
     • Pushes to main, feature/*, or merge requests.
     • Scheduled nightly CI jobs.
   • By default, these jobs are run in parallel
2. Image Deployment
   • After downloading:

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       docker load -i image.tar
     

   • Final deployment pushes image to GitLab Container Registry or Docker Hub.

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