Semi-Bug: CRDs with {{}} cause issues with helm, if CRD templating is enabled

[tamcore]

Issue
Sometimes upstream CRDs have things like {{ .cluster.name }}-{{ .random }} in their description fields (like the ClusterClass CRD of cluster-api, see bellow), which should be present as-is in the final helm output / installation. But because {{ and }} are interpreted by helm, that leads to errors during templating.

Desired solution
Have helmify detect usage of {{}} in the provided manifests and replace them with

{{`{{

and

}}`}}

respectively. As shown bellow in the workaround.

How to reproduce
Create chart

curl -sL https://github.com/kubernetes-sigs/cluster-api/releases/download/v1.7.0/core-components.yaml | \
  go run github.com/arttor/helmify/cmd/[email protected] -vv

and then try to render the generated chart

$ helm template .
zsh: correct 'template' to 'templates' [nyae]? n
Error: template: chart/templates/clusterclass-crd.yaml:679:74: executing "chart/templates/clusterclass-crd.yaml" at <.cluster.name>: nil pointer evaluating interface {}.name

Use --debug flag to render out invalid YAML

Workaround
exists by wrapping the {{}} as part of the pipeline

curl -sL https://github.com/kubernetes-sigs/cluster-api/releases/download/v1.7.0/core-components.yaml | \
  sed -e 's@{{@{{`{{@g' -e 's@}}@}}`}}@g' | \
  go run github.com/arttor/helmify/cmd/[email protected] -vv