scaffolder-backend: fix retrieving credentials

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

.changeset/light-squids-eat.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Fixed an issue causing actions to fail when retrieving auth credentials

plugins/scaffolder-backend/src/scaffolder/tasks/NunjucksWorkflowRunner.ts

@@ -434,7 +434,7 @@ export class NunjucksWorkflowRunner implements WorkflowRunner {
           user: task.spec.user,
           isDryRun: task.isDryRun,
           signal: task.cancelSignal,
-          getInitiatorCredentials: task.getInitiatorCredentials,
+          getInitiatorCredentials: () => task.getInitiatorCredentials(),
         });
       }