Add RBAC as required config
What does this MR do?
This MR adds RBAC as the third required config.
Why was this MR needed?
Almost all clusters have RBAC enabled now. Which means the minimum required config includes rbac: { enabled: true } in order to allow GitLab Runner to create pods and run jobs.
What's the best way to test this MR?
Follow the Helm installation instructions and include the new config.