Missing metav1 registration for CNPG scheme group version

[NiccoloFei]

After the controller-runtime v0.24.0 upgrade (58f4fed), the following error is being continuously logged on every WAL archive:

{
  "level": "error",
  "ts": "2026-06-05T13:34:33.255699964Z",
  "msg": "Retention policy enforcement failed",
  "logging_pod": "cluster-example-1",
  "error": "v1.GetOptions is not suitable for converting to \"postgresql.cnpg.io/v1\" in scheme \"pkg/runtime/scheme.go:111\"",
  "stacktrace": "github.com/cloudnative-pg/machinery/pkg/log.(*logger).Error\n\t/go/pkg/mod/github.com/cloudnative-pg/machinery@v0.5.0/pkg/log/log.go:128\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).Start\n\t/workspace/internal/cnpgi/instance/retention.go:66\nsigs.k8s.io/controller-runtime/pkg/manager.(*runnableGroup).reconcile.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.24.1/pkg/manager/runnable_group.go:260"
}

[dosubot]

The root cause is a missing metav1.AddToGroupVersion() call for the CNPG types (postgresql.cnpg.io/v1) after the controller-runtime v0.24.0 upgrade.

During the migration (PR #880), the Barman Cloud API registration (barmancloud.cnpg.io/v1) was correctly updated to include metav1.AddToGroupVersion(scheme, GroupVersion) [1], but the CNPG types registration was not. This causes the scheme to not recognize v1.GetOptions as compatible with the postgresql.cnpg.io/v1 group when the retention policy enforcement performs Client.Get() operations [2].

The fix would be to add metav1.AddToGroupVersion in both locations where CNPG types are registered:

internal/scheme/cnpg.go [3]:

scheme.AddKnownTypes(cnpgGroupVersion,
    &cnpgv1.Cluster{},
    &cnpgv1.ClusterList{},
    &cnpgv1.Backup{},
    &cnpgv1.BackupList{},
    &cnpgv1.ScheduledBackup{},
    &cnpgv1.ScheduledBackupList{},
)
metav1.AddToGroupVersion(scheme, cnpgGroupVersion) // missing

internal/cnpgi/common/scheme.go [4]:

result.AddKnownTypes(cnpgGroupVersion,
    &cnpgv1.Cluster{},
    &cnpgv1.ClusterList{},
    &cnpgv1.Backup{},
    &cnpgv1.BackupList{},
    &cnpgv1.ScheduledBackup{},
    &cnpgv1.ScheduledBackupList{},
)
metav1.AddToGroupVersion(result, cnpgGroupVersion) // missing

This matches the pattern already used for the Barman Cloud API group registration.

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