add support to scaffold oci helm registry charts (#6999)

Signed-off-by: Adam D. Cornett <adc@redhat.com>

Author: acornett21

internal/plugins/helm/v1/api.go

@@ -108,6 +108,9 @@ func (p *createAPISubcommand) UpdateMetadata(cliMeta plugin.CLIMetadata, subcmdM
 
   $ %[1]s create api \
       --helm-chart=/path/to/local/chart-archives/app-1.2.3.tgz
+
+  $ %[1]s create api \
+      --helm-chart=oci://charts.mycompany.com/example-namespace/app:1.2.3
 `, cliMeta.CommandName)
 }
 

internal/plugins/helm/v1/chartutil/chart.go

@@ -27,6 +27,7 @@ import (
 	"helm.sh/helm/v3/pkg/cli"
 	"helm.sh/helm/v3/pkg/downloader"
 	"helm.sh/helm/v3/pkg/getter"
+	"helm.sh/helm/v3/pkg/registry"
 	"helm.sh/helm/v3/pkg/repo"
 )
 
@@ -126,11 +127,19 @@ func LoadChart(opts Options) (*chart.Chart, error) {
 func downloadChart(destDir string, opts Options) (string, error) {
 	settings := cli.New()
 	getters := getter.All(settings)
+
+	// Create registry client for OCI registry support
+	registryClient, err := registry.NewClient()
+	if err != nil {
+		return "", fmt.Errorf("failed to create registry client: %w", err)
+	}
+
 	c := downloader.ChartDownloader{
 		Out:              os.Stderr,
 		Getters:          getters,
 		RepositoryConfig: settings.RepositoryConfig,
 		RepositoryCache:  settings.RepositoryCache,
+		RegistryClient:   registryClient,
 	}
 
 	if opts.Repo != "" {
@@ -182,13 +191,20 @@ func fetchChartDependencies(chartPath string) error {
 	settings := cli.New()
 	getters := getter.All(settings)
 
+	// Create registry client for OCI registry support
+	registryClient, err := registry.NewClient()
+	if err != nil {
+		return fmt.Errorf("failed to create registry client: %w", err)
+	}
+
 	out := &bytes.Buffer{}
 	man := &downloader.Manager{
 		Out:              out,
 		ChartPath:        chartPath,
 		Getters:          getters,
 		RepositoryConfig: settings.RepositoryConfig,
 		RepositoryCache:  settings.RepositoryCache,
+		RegistryClient:   registryClient,
 	}
 	if err := man.Build(); err != nil {
 		fmt.Println(out.String())