Currently, the tutorial for GitLab CI/CD supposes branch support. This won't work for the Community Edition. We need to change the 3rd step, "Create or update the configuration file":
- Update the YAML example, so that the only: block only lists master # or the name of your main branch
- Update the last sentence that says: "Note that this is a minimal base configuration to run a SonarQube analysis on your master branch and merge requests."