Add managed registry provisioning, pruning, and readiness tracking

app/Models/Operation.php

@@ -30,6 +30,7 @@ class Operation extends Model
         return [
             'kind' => OperationKind::class,
             'status' => OperationStatus::class,
+            'metadata' => 'array',
             'started_at' => 'datetime',
             'finished_at' => 'datetime',
         ];