Patroni: Document backup/restore procedures
### Problem to solve Include specific instructions on how to run gitlab backup task against a Patroni cluster. ### Further details It seems we are bounded to the same limitations from https://docs.gitlab.com/ee/raketasks/backup_restore.html#backup-and-restore-for-installations-using-pgbouncer ### Proposal <!-- Further specifics for how can we solve the problem. --> ### Who can address the issue <!-- What if any special expertise is required to resolve this issue? --> ### Other links/references <!-- E.g. related GitLab issues/MRs -->
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