title: How to control indent after including file content in Helm configMap?
body: <p>I'm setting up a ConfigMap for my Helm chart.</p>
  
  <p>As per good practice, I want to include non-yaml resources through separate files rather than inline. Currently I am trying to include both an xml file and a tpl helper in my ConfigMap under "data". Both are read without issue in the below code. But I cannot seem to make the indentation for the keys work properly.</p>
  
  <p>My ConfigMap:</p>
  
  <pre><code>apiVersion: v1
  kind: ConfigMap
  metadata:
      name: {{ template "name" . }}
      labels:
          app: {{ template "name" . }}
          chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
          release: {{ quote .Release.Name }}
          heritage: {{ quote .Release.Service }}
          name: {{ template "name" . }}
  data:
      logback.xml: |-
          {{- .Files.Get "application-resources/logback.xml" | nindent 8 -}}
      application.yml: |-
          {{- include "application.yml" . | nindent 8 -}}
  </code></pre>
  
  <p>This produces the following indentation (actual values are removed for readability):</p>
  
  <pre><code>apiVersion: v1
  kind: ConfigMap
  metadata:
      name: erklaering-anden-lov-detektor-app
      labels:
          app: name-of-app
          chart: name-of-chart
          release: "release-name"
          heritage: "Tiller"
          name: name-of-app
  data:
      logback.xml: |-
        &lt;?xml version="1.0" encoding="UTF-8"?&gt;
        &lt;configuration scan="true"&gt;
            &lt;xml-stuff&gt;
        &lt;/configuration&gt;
        application.yml: |-    
        application.yml.contents
  </code></pre>
  
  <p>Which should be:</p>
  
  <pre><code>apiVersion: v1
  kind: ConfigMap
  metadata:
      name: erklaering-anden-lov-detektor-app
      labels:
          app: name-of-app
          chart: name-of-chart
          release: "release-name"
          heritage: "Tiller"
          name: name-of-app
  data:
      logback.xml: |-
        &lt;?xml version="1.0" encoding="UTF-8"?&gt;
        &lt;configuration scan="true"&gt;
            &lt;xml-stuff&gt;
        &lt;/configuration&gt;
      application.yml: |-    
        application.yml.contents
  </code></pre>
  
  <p>I'm at my wit's end. What am I doing wrong? How do I make yaml snap back to recognizing configMap's own indentation and/or explicitly control it?</p>