[UX Demo] One-click deploy of GitLab to Openshift

Description

Demo one-click deploy of GitLab to Openshift

Proposal

Pre-add the GitLab configuration to Openshift
Pre-fix NFS issues
Demo script:
- Open Openshift web UI
- Find GitLab in list of templates
- Click
- Show running GitLab
- ...
- Profit

Links / references

Meta issue: #19793 (closed)