pipeline: Failed to pull kaniko image from private repo

Service account

apiVersion: v1
imagePullSecrets:
- name: basic-user-pass
kind: ServiceAccount
metadata:
  name: 5f7ac2569596510001b034b7-sa
  namespace: tekton

Task

apiVersion: tekton.dev/v1beta1
kind: TaskRun
metadata:
  name: app-builder5fc89e3fdbf91600010d0012-task-run
  namespace: tekton
spec:
  serviceAccountName: 5f7ac2569596510001b034b7-sa
  taskRef:
    kind: Task
    name: app-builder5fc89e3fdbf91600010d0012

Task

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: app-builder5fc89e3fdbf91600010d0012
  namespace: tekton
spec:
  steps:
  - image: <url>
    imagePullPolicy: Always
    name: app