app-deploy.yaml

apiVersion: tekton.dev/v1alpha1
kind: Pipeline
metadata:
  name: app-deploy
spec:
# Check https://github.com/tektoncd/pipeline/blob/master/docs/pipelines.md on how to define parameters
#  params: 
  resources: 
  - name: app-source
    type: git
  - name: app-image
    type: image
  tasks: 
   - name: build-java
     taskRef:
       name: build-app
     params:
      - name: contextDir
        value: app
      - name: mavenMirrorUrl
        value: http://nexus:8081/nexus/content/groups/public
     resources:
      inputs:
       - name: source
         resource: app-source
      outputs:
       - name: builtImage
         resource: app-image
   - name: deploy-app
     taskRef:
       name: openshift-client
     runAfter:
      - build-java
     params:
      - name: ARGS
        value: "run --image=dev.local/example/helloworld --image-pull-policy=Never --generator=deployment/apps.v1 helloworld"
        # if you are OpenShift uncomment the line below.
        #value: "run --image=image-registry.openshift-image-registry.svc:5000/tutorial/helloworld --image-pull-policy=Never --generator=deployment/apps.v1 helloworld"