Draft: Docs: Document how to migrate from bundled stateful services

Clemens Beckrequested to merge
cb-migration-bitnami-minio-docs into master

What does this MR do?

Docs: Document how to migrate from bundled stateful services

  • Document how to migrate bundled MinIO to Garage.
  • Document how to migrate bundled Redis to Valkey.
  • Document how to migrate bundled PostgreSQL to CloudNativePG.

The migration process can be desribed in three phases:

  1. Backup the instance.
  2. Provision external services and configure GitLab for them.
  3. Restore backup into new services.

The migration was tested on GKE 1.33 but should be provider agnostic.

Closes #6230

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  • Equivalent MR/issue for omnibus-gitlab opened.

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