Document OpenBao backup and restore

Clemens Beckrequested to merge
cb-openbao-backup-restore-docs into master

What does this MR do?

Document OpenBao backup and restore

Document the OpenBao backup and restore process and the current limitations and assumptions.

Relates https://gitlab.com/gitlab-org/charts/gitlab/-/issues/6036

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Author checklist

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Required

For anything in this list which will not be completed, please provide a reason in the MR discussion.

  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

Edited by Clemens Beck

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