crd, Adding PreserveUnknownFields=false to crd spec to fix upgrade issue

there is an issue where on upgrade of apiVersion from
apiextensions.k8s.io/v1beta1 to apiextensions.k8s.io/v1,
oc explain does not show the CR documentation.
This is solved in parallel PRs (SSP PR [1], CDI PR [2])
by adding PreserveUnknownFields=false to the CRD's spec

[1] kubevirt/kubevirt-ssp-operator@7ecd297
[2] kubevirt/containerized-data-importer#1343

Signed-off-by: Ram Lavi <[email protected]>

tools/manifest-templator/manifest-templator.go

@@ -195,6 +195,7 @@ func getCNA(data *templateData) {
 	crd := components.GetCrd()
 	marshallObject(crd, &writer)
 	crdString := writer.String()
+	crdString = addPreserveUnknownFields(crdString)
 	crdVersion := crd.Spec.Versions[0].Name
 
 	// Get CNA CR
@@ -224,6 +225,12 @@ func getCNA(data *templateData) {
 	data.CNA = &cnaData
 }
 
+func addPreserveUnknownFields(crdString string) string {
+	// TODO replace this solution with a better one once this issue get resolved:
+	// https://github.com/kubernetes/apiextensions-apiserver/issues/48
+	return crdString + "  preserveUnknownFields: false"
+}
+
 func main() {
 	version := flag.String("version", "", "The csv version")
 	versionReplaces := flag.String("version-replaces", "", "The csv version this replaces")