In short
Defining your CI/CD pipeline itself in a version-controlled file (Jenkinsfile, .github/workflows, .gitlab-ci.yml) rather than configuring it manually through a UI — applying the same discipline from Phase 4 to pipeline configuration.
How to learn this
- 1Convert a manually-configured pipeline step into a version-controlled config file if you have one.
- 2Learn why pipeline changes going through pull request review catches mistakes before they break builds.
- 3Understand this is the same 'everything as code' philosophy that extends into Phase 9's infrastructure as code.
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