comment out trivy scan since it is failing
After https://github.com/aquasecurity/trivy/commit/eb9741954ca809407148423c8826e3cb8af4ca19, the trivy scans are failing.
This needs a re-think (in general), since in GitLab Ultimate we can leverage of Container Scanning with https://docs.gitlab.com/ee/user/application_security/container_scanning/#configuration