Artifacts copy step template

[rafalbigaj]

/kind feature

Description:
Custom artifacts copy step requires access to specific secrets and env variables. It would be extremely useful to be able to provide a container template for this step in configuration.

Additional information:
The new configuration option ARTIFACT_COPY_STEP_TEMPLATE should allow to specify a artifacts copy step template, e.g.:

{
  "ARTIFACT_COPY_STEP_TEMPLATE": {
    "image": "us.icr.io/ai-lifecycle/cpdctl:0.1.59",
    "volumeMounts": [
      {"name": "cpdconfig", "mountPath": "/opt/app-root/src/cpdconfig", "readOnly": true}
    ],
    "env": [
      {"name": "CPDCONFIG", "value": "/opt/app-root/src/cpdconfig/config"},
      {"name": "SCOPE", "valueFrom": {"fieldRef": {"fieldPath": "metadata.labels['orchestration/scope']"}}}
    ]
  }
}

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