PushSecret (home) + ExternalSecret (VPS) pairs for the four
chart-generated secrets whose values must match before Phase 1c's
Postgres replication goes live: gitlab-rails-secret (secret_key_base/
db_key_base/otp_key_base/openid_connect_signing_key, all in one
secrets.yml key - confirmed live, not four separate keys as first
assumed), gitlab-gitlab-shell-secret, gitlab-gitaly-secret,
gitlab-praefect-secret (the latter two also needed for Phase 2's
cross-site gRPC auth). Same pattern as
infrastructure/authentik/manifests/ha-postgres-app-pushsecret.yaml.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
