Add another example for better clarity

[wsierakowski]

I might have a problem with understanding the provided example, it is not entirely clear to me how to write to the properties file. Based on my understanding, I came up with the following pipeline:

jobs:
- name: job1
  plan:
  - get: source-repo
    trigger: false
  - task: get-version
    config:
      platform: linux
      image_resource:
        type: registry-image
        source:
          repository: node
          tag: 16
      inputs:
      - name: source-repo
      run:
        path: sh
        args:
        - -cx
        - |
          mkdir keyvalout
          echo tag=123 > keyvalout/keyval.properties
  - put: keyval
    params:
      file: keyvalout/keyval.properties
- name: job2
  plan:
  - in_parallel:
    - get: keyval
      passed: [job1]
  - task: list-files
    config:
      platform: linux
      image_resource:
        type: registry-image
        source:
          repository: node
          tag: 16
      inputs:
      - name: source-repo
      run:
        path: sh
        args:
        - -cx
        - |
          ls -lah keyvalout
          cat keyvalout/keyval.properties

...but the keyval-resource doesn't work giving me this error:

reading input file /tmp/build/put/keyvalout/keyval.properties
2021/08/18 16:40:12 open /tmp/build/put/keyvalout/keyval.properties: no such file or directory

I'm pretty sure the resource works, I'm just not able to use it correctly with the example provided.