I'm using the frontend chart and have seen errors when I've added a multiline command. Should it be possible? In that case I suppose this line:
https://github.com/wunderio/charts/blob/master/frontend/templates/services-deployment.yaml#L174
{ $service.postinstall.command }}
should be changed to something like
{{- toYaml $service.postinstall.command | nindent 10 }}?