fix(deployment): evaluate initContainers template

[dmunozv04]

Thank you for making node-red ⚙ better

Please reference the issue this PR is fixing. There's no issue that this PR fixes. I can open one if needed.

Rendering the initContainers as helm templates allows referencing values in them, like being able to use the same image on the main and init containers.

For example:

initContainers:
  - name: test-container
    image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
    command: ["/bin/sh", "-c", "echo Hello from the test container! && sleep 30"]

Other projects also do this: apache/superset#31878
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