added an example.

tekton-catalog/pipeline-loops/examples/pipelinespec-with-nested-loop-embedded.yaml

@@ -0,0 +1,96 @@
+apiVersion: tekton.dev/v1beta1
+kind: PipelineRun
+metadata:
+  name: pr-loop-example
+  labels:
+    mylooplabels: mylooplabels
+spec:
+  pipelineSpec:
+    tasks:
+      - name: first-task
+        taskSpec:
+          steps:
+            - name: echo
+              image: ubuntu
+              imagePullPolicy: IfNotPresent
+              script: |
+                #!/usr/bin/env bash
+                echo "I am the first task before the loop task"
+      - name: loop-task
+        runAfter:
+          - first-task
+        params:
+          - name: message
+            value:
+              - I am the first one
+              - I am the second one
+              - I am the third one
+        taskSpec:
+          apiVersion: custom.tekton.dev/v1alpha1
+          kind: PipelineLoop
+          spec:
+            iterateParam: message
+            pipelineSpec:
+              params:
+                - name: message
+                  type: string
+              tasks:
+                - name: echo-loop-task
+                  params:
+                    - name: message
+                      value: $(params.message)
+                  taskSpec:
+                    params:
+                      - name: message
+                        type: string
+                    steps:
+                      - name: echo
+                        image: ubuntu
+                        imagePullPolicy: IfNotPresent
+                        script: |
+                          #!/usr/bin/env bash
+                          echo "$(params.message)"
+                - name: loop-task-inner
+                  runAfter:
+                    - echo-loop-task
+                  params:
+                    - name: message
+                      value:
+                        - I am the inner first one
+                        - I am the inner second one
+                  taskSpec:
+                    apiVersion: custom.tekton.dev/v1alpha1
+                    kind: PipelineLoop
+                    spec:
+                      iterateParam: message
+                      pipelineSpec:
+                        params:
+                          - name: message
+                            type: string
+                        tasks:
+                          - name: echo-loop-task
+                            params:
+                              - name: message
+                                value: $(params.message)
+                            taskSpec:
+                              params:
+                                - name: message
+                                  type: string
+                              steps:
+                                - name: echo
+                                  image: ubuntu
+                                  imagePullPolicy: IfNotPresent
+                                  script: |
+                                    #!/usr/bin/env bash
+                                    echo "$(params.message)"
+      - name: last-task
+        runAfter:
+          - loop-task
+        taskSpec:
+          steps:
+            - name: echo
+              image: ubuntu
+              imagePullPolicy: IfNotPresent
+              script: |
+                #!/usr/bin/env bash
+                echo "I am the last task after the loop task"