Workaround to make helm (v3) template to render crds

cmd/helm3.go

@@ -85,6 +85,13 @@ func (d *diffCmd) template() ([]byte, error) {
 		}
 	}
 
+	//This is a workaround until https://github.com/helm/helm/pull/6729 is released
+	for _, apiVersion := range strings.Split(os.Getenv("HELM_TEMPLATE_API_VERSIONS"), ",") {
+		if apiVersion != "" {
+			flags = append(flags, "--api-versions", strings.TrimSpace(apiVersion))
+		}
+	}
+
 	args := []string{"template", d.release, d.chart}
 	args = append(args, flags...)
 	cmd := exec.Command(os.Getenv("HELM_BIN"), args...)

plugin.yaml

@@ -1,7 +1,7 @@
 name: "diff"
 # Version is the version of Helm plus the number of official builds for this
 # plugin
-version: "3.0.0-rc.3"
+version: "3.0.0-rc.4"
 usage: "Preview helm upgrade changes as a diff"
 description: "Preview helm upgrade changes as a diff"
 useTunnel: true