Mapping interpolated env configs

pipeline.yml

# AFTER - export-installation uses post-interpolated configurations
- name: export-installation
    serial: true
    plan:
      - aggregate:
          - get: daily-trigger
            trigger: true
          - get: platform-automation-image
            params:
              unpack: true
          - get: platform-automation-tasks
            params:
              unpack: true
          - get: configuration
      - task: credhub-interpolate
        image: platform-automation-image
        file: platform-automation-tasks/tasks/credhub-interpolate.yml
        params:
          CREDHUB_CLIENT: ((credhub-client))
          CREDHUB_SECRET: ((credhub-secret))
          CREDHUB_SERVER: ((credhub-server))
          CREDHUB_CA_CERT: ((credhub-ca-cert))
          PREFIX: '/pipeline/gcp'
          INTERPOLATION_PATH: "env"
        input_mapping:
          files: configuration
        output_mapping:
          interpolated-files: interpolated-env
      - task: export-installation
        image: platform-automation-image
        file: platform-automation-tasks/tasks/export-installation.yml
        input_mapping:
          env: interpolated-env
        params:
          ENV_FILE: env/((foundation))/env/env.yml
          INSTALLATION_FILE: installation-$timestamp.zip
      - put: installation
        params:
          file: installation/installation*.zip