What continuous integration and delivery (CI/CD) systems have you worked with?

I have worked with several CI/CD systems, including:

• GitHub Actions — for automating builds, testing, and deployment directly from a GitHub repository. It allows creating custom workflows triggered by push, pull request, and other events.
• Azure DevOps Pipelines — a powerful tool for building build and release pipelines, supporting integration with various languages and platforms, as well as deployment to Azure cloud.

Both systems enable automation of integration and delivery processes, configuring step sequences, running tests, and deploying, which significantly speeds up development and reduces errors during releases.