How can you add a runner in GitLab to perform CI/CD tasks?

In GitLab runner, you can add it in the following ways:

1. Through the GitLab interface — register a runner in the project or group settings by following the installation and registration instructions.

2. Via the command line — install GitLab Runner on a server or local machine and register it using the command:

gitlab-runner register

3. Using Docker — run GitLab Runner in a Docker container and register it.

4. Using Kubernetes — install GitLab Runner in a Kubernetes cluster using the Helm chart.

Each method requires specifying the GitLab URL, registration token, runner description, tag, and executor (e.g., shell, docker).