Run pipeline via PR

Run the pipeline via Pull Request

main is protected: changes go feature branch -> PR -> merge. A PR runs the sonar job; a merge runs the docker + helm jobs.

• 7.1 Commit the pipeline
• 7.2 Update SONAR_HOST_URL
• 7.3 Raise a Pull Request
• 7.4 Check the Quality Gate
• 7.5 Merge & run Docker + Helm
• 7.6 Verify the result