generate tf outputs in iacm stage

tf_output_json_container.yaml

- step:
    type: Run
    name: tf output json container
    identifier: tf_output_json_container
    spec:
      # use the Harness plugin used by TF steps to avoid pulling another container
      connectorRef: account.harnessImage
      image: plugins/harness_terraform:latest
      shell: Sh
      command: |-
        # use the binary created by the plugin in earlier steps, change `apply` to the ID of the apply step
        <+execution.steps.apply.steps.apply.output.outputVariables.binary> -chdir=/harness/<+workspace.folderPath> output -json > tf_outputs.json

        cat tf_outputs.json