Simplify input type Helm

[gburiola]

At the moment, in order to use input_type: helm we need to declare all of this:

parameters:

  kapitan:

    dependencies:
    - type: https
      source: https://<REPO_NAME>/<CHART_NAME>-<VERSION>.tgz
      unpack: True
      output_path: .charts

    compile:
      - output_path: my_dir
        input_type: helm
        input_paths:
          - .charts/<CHART_NAME>
        helm_values:
          key1: value1
        helm_params:
          name: my_release
          namespace: my_namespace

I propose we simplify the above, by removing the external dependency and using the helm cli directly to fetch the chart.

parameters:

  kapitan:

    compile:
      - output_path: my_dir
        input_type: helm
        helm_values:
          key1: value1
        helm_params:
          name: my_release
          namespace: my_namespace
          repo: <REPO_NAME>
          chart: <CHART_NAME>
          version: <VERSION>

We can do that by using the helm cli flags --repo <REPO_NAME> --version <VERSION> <CHART_NAME>
This would be done in this file here

Benefits

1. Simplified inventory code
2. No more locally fetched charts inside output_path: .charts
3. In addition to the direct benefits listed above, it also allows us to use multiple different chart versions. At the moment this is not possible, because dependencies are extracted to <OUTPUT_PATH>/<CHART_NAME>. So if you fetch 2 different versions of the same chart they will overwrite each other.

[github-actions]

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