GitLab version of Kosli Labs

[tooky]

Description

We have a comprehensive Kosli Labs walking through customers implementing Kosli using GitHub. GitLab has similarities but also some differences and we should have just as good support for those customers using GitLab.

Acceptance criteria

• Identify differences between GitHub and GitLab workflows in existing Kosli Labs content
• Create GitLab-specific versions of Kosli Labs tutorials
• Ensure feature parity with the existing GitHub-based labs