Adding CI docs

Author: resizes-bot

docs/ci-cd/continuous-integration.md

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 # Continuous Integration
 
-Continuous Integration (CI) is a software development practice where developers regularly merge their code changes into a central repository, after which automated builds and tests are run. The key goals of CI are to find and address bugs quicker, improve software quality, and reduce the time it takes to validate and release new software updates.
+Continuous Integration (CI) is a software development practice where members of a team integrate their work frequently, usually each person integrates at least daily — leading to multiple integrations per day. Each integration is automatically verified by building the project and running automated tests. This approach leads to significantly reduced integration problems and allows a team to develop cohesive software more rapidly.
 
-:::warning
-🚧 Work in progress 🚧
-:::
+## Key Concepts
+
+### Integration
+
+Integration refers to the process of combining individual software modules into a unified system. In the context of CI, integration happens frequently and is automated to ensure that new code changes work with the existing codebase.
+
+### Automation
+
+Automation in CI involves the use of tools to automatically build, test, and deploy code changes. This is crucial for speeding up the development process and reducing manual errors.
+
+### Build
+
+The build process compiles source code into executable code. This process may also include packaging the code into deployable artifacts, such as binaries or web application archives.
+
+### Test
+
+Automated testing runs predefined tests against the codebase to ensure that new changes do not break existing functionality. This includes unit tests, integration tests, and sometimes, end-to-end tests.
+
+## CI Process
+
+1. **Commit**: Developers commit changes to the version control repository. Commits should be small and frequent to minimize integration issues.
+2. **Build**: The CI server monitors the repository and triggers a build for each new commit.
+3. **Test**: Alongside building, automated tests are run. These tests should cover as much of the codebase as possible.
+4. **Report**: The results of the build and test processes are reported to the team. If any step fails, the team is alerted immediately.
+5. **Fix**: Developers quickly fix the issue if the integration fails. The goal is to keep the codebase in a working state.
+
+## Best Practices
+
+- **Maintain a Single Source Repository**: Ensure that your codebase is in a version control system accessible to all team members and the CI server.
+- **Automate the Build**: The build process should be fully automated and capable of generating a deployable artifact.
+- **Make Builds Self-Testing**: Ensure that your automated tests are comprehensive and reliable.
+- **Fix Broken Builds Immediately**: Treat broken builds as a top priority to maintain the stability of the codebase.
+- **Keep the Build Fast**: Optimize build and test processes to provide rapid feedback.
+- **Test in a Clone of the Production Environment**: Use a test environment that mirrors production as closely as possible to catch environment-specific issues.
+- **Make it Easy to Get the Latest Deliverables**: Automate deployment processes to make it easy for testers and stakeholders to access the latest version.
+- **Everyone Commits to the Mainline Every Day**: Encourage frequent integration to reduce integration issues.
+- **Transparent Build Results**: Make the results of the builds and tests visible to the entire team to promote accountability and quick response to issues.
+
+## CI Tools
+
+There are many CI tools available, each with its own set of features and integrations. Some popular CI tools include:
+
+- **Jenkins**: An open-source automation server that supports building, deploying, and automating any project.
+- **Travis CI**: A cloud-based CI service that integrates with GitHub repositories.
+- **CircleCI**: A cloud-based CI/CD platform that automates the software development process.
+- **GitLab CI**: A part of GitLab's DevOps platform that provides continuous integration and continuous delivery.
+- **GitHub Actions**: A CI/CD service provided by GitHub that allows you to automate your workflow directly from your repository.
+
+## Conclusion
+
+Continuous Integration is a fundamental practice in modern software development. It helps teams to catch integration issues early, maintain a stable codebase, and deliver high-quality software more rapidly. By automating the build, test, and deployment processes, teams can focus on writing code and delivering value to their users.