How to run all the steps in the same POD when a pipeline step is run

The below articles takes you through on how to run all the steps in the same POD when a pipeline step is run.

The process is simple , Create an output variable with hostname and use it as delegate selector in the following steps/stages

Sample Pipeline :

pipeline:
  name: testpipeline
  identifier: testpipeline
  projectIdentifier: usheertest
  orgIdentifier: usheernew
  tags: {}
  stages:
    - stage:
        name: shell
        identifier: shell
        description: ""
        type: Custom
        spec:
          execution:
            steps:
              - step:
                  type: ShellScript
                  name: select_delegate
                  identifier: select_delegate
                  spec:
                    shell: Bash
                    onDelegate: true
                    source:
                      type: Inline
                      spec:
                        script: |
                          echo $HOSTNAME
                          HOST_SELECTOR=$HOSTNAME
                    environmentVariables: []
                    outputVariables:
                      - name: HOST_SELECTOR
                        type: String
                        value: HOST_SELECTOR
                  timeout: 10m
              - step:
                  type: ShellScript
                  name: use delegate
                  identifier: use_delegate
                  spec:
                    shell: Bash
                    onDelegate: true
                    source:
                      type: Inline
                      spec:
                        script: echo <+execution.steps.select_delegate.output.outputVariables.HOST_SELECTOR>
                    environmentVariables: []
                    outputVariables: []
                    delegateSelectors:
                      - <+execution.steps.select_delegate.output.outputVariables.HOST_SELECTOR>
                  timeout: 10m
                  failureStrategies: []
        tags: {}