Update Geo external database documentation to include helm chart details
Problem to solve
https://docs.gitlab.com/ee/administration/geo/setup/external_database.html currently only documents the usage of external databases with Geo using omnibus-gitlab
- What product or feature(s) affected? Geo
- What docs or doc section affected? Include links or paths. https://docs.gitlab.com/ee/administration/geo/setup/external_database.html
- Is there a problem with a specific document, or a feature/process that's not addressed sufficiently in docs?
- Any other ideas or requests?
Proposal
Add steps to document using the helm charts/operator as well
Who can address the issue
Geo or Distribution team engineers should be qualified.