Allow metadatabase to be attached in tests. (#393)

Author: mbrandonw

Sources/SQLiteData/CloudKit/SyncEngine.swift

@@ -106,7 +106,7 @@
       let containerIdentifier =
         containerIdentifier
         ?? ModelConfiguration(groupContainer: .automatic).cloudKitContainerIdentifier
-        ?? (context == .preview ? "preview" : nil)
+        ?? (context != .live ? "container" : nil)
       var allTables: [any SynchronizableTable] = []
       var allPrivateTables: [any SynchronizableTable] = []
       for table in repeat each tables {
@@ -2212,7 +2212,7 @@
       let containerIdentifier =
         containerIdentifier
         ?? ModelConfiguration(groupContainer: .automatic).cloudKitContainerIdentifier
-        ?? (context == .preview ? "preview" : nil)
+        ?? (context != .live ? "container" : nil)
 
       guard let containerIdentifier else {
         throw SyncEngine.SchemaError.noCloudKitContainer