feat: implement rollback registry functionality in application settings

- Added a new optional field `rollbackRegistryId` to the application schema to support rollback registry selection.
- Enhanced the form in the ShowRollbackSettings component to include a dropdown for selecting a rollback registry when rollbacks are enabled.
- Updated the application service to handle rollback registry logic during deployment and rollback processes.
- Improved error handling and validation for rollback settings, ensuring a registry is selected when rollbacks are active.
- Adjusted database schema and migration files to accommodate the new rollback registry feature.

packages/server/src/db/schema/registry.ts

@@ -39,6 +39,9 @@ export const registryRelations = relations(registry, ({ many }) => ({
 	buildApplications: many(applications, {
 		relationName: "applicationBuildRegistry",
 	}),
+	rollbackApplications: many(applications, {
+		relationName: "applicationRollbackRegistry",
+	}),
 }));
 
 const createSchema = createInsertSchema(registry, {