How is build automation for projects implemented within CI/CD pipelines?

Build automation in CI/CD pipelines is carried out using scripts and tools that perform a sequence of steps without manual intervention. Typically, the process includes:

• Obtaining source code from a version control system (e.g., Git).
• Installing dependencies.
• Compiling or building the project.
• Running tests.
• Creating artifacts (e.g., binaries, containers).
• Deploying to test or production environments.

Tools such as Jenkins, GitLab CI, GitHub Actions, CircleCI, and others are used for automation. Configuration files describe the build steps that are executed on each commit or on a schedule.

An example of a simple build script in GitLab CI:

stages:
  - build
  - test

build_job:
  stage: build
  script:
    - pip install -r requirements.txt
    - python setup.py build

test_job:
  stage: test
  script:
    - pytest tests/

Thus, building and testing happen automatically with each code change.