Task: Add GitLab Integration Example

[immxmmi]

Description

The Techlab demonstrates CI/CD integration with Dagger, but only with GitHub. Since many companies use GitLab, an example for GitLab CI/CD integration would be beneficial.

Proposal

• Add a GitLab CI/CD pipeline example for running Dagger.
• Show how to call Dagger functions within a .gitlab-ci.yml pipeline.

This would make the Techlab more relevant for GitLab users and expand its applicability.