Use existingClaim for SSO backend
#414 (closed) describes the problem that sometimes local-storage is deployed after other apps already claimed volumes, which can lead to situations like this where early created PVC doesn't have the local-storage class set and won't recover by themselves:
❯ kc get pvc --all-namespaces
NAMESPACE NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
oas single-sign-on-userbackend Pending