app-build-task-run.yaml

apiVersion: tekton.dev/v1alpha1
kind: TaskRun
metadata:
  generateName: build-app-
spec:
  serviceAccount: pipeline
  taskRef:
    name:  build-app
  inputs:
   resources:
    - name: source
      resourceRef:
        name: git-source
   params:
    - name: contextDir
      value: app
    # Enable if you have maven mirrors to use
    # - name: mavenMirrorUrl
    #   value: http://nexus:8081/nexus/content/groups/public
  outputs:
   resources:
    - name: builtImage
      resourceRef:
        name: helloworld-image