Topology Service is configured in GitLab Rails

Proposal

Topology Service needs to be added to config/gitlab.yml:

topology_service:
  address: topology-service.runway.gitlab.net:443
  ca: /path/to/ca.pem
  certificate: /path/to/certificate.pem
  private_key: /path/to/certificate.key
cell:
  name: cell-100
  address: cell-100.gitlab.com

It uses a path to certificates as we decided to secure it with mTLS.