Add manifest creation command

internal/cli/root.go

@@ -33,6 +33,8 @@ func Execute(ctx context.Context, args []string, stdout, stderr io.Writer) int {
 		return validateCommand(ctx, args[1:], stdout, stderr)
 	case "inspect":
 		return inspectCommand(ctx, args[1:], stdout, stderr)
+	case "manifest":
+		return manifestCommand(ctx, args[1:], stdout, stderr)
 	default:
 		fmt.Fprintf(stderr, "%s: unknown command %q\n\n", app.Name, args[0])
 		printRootHelp(stderr)
@@ -51,6 +53,7 @@ Commands:
   run        Run configured distribution pipelines
   validate   Validate a source bundle or bundle tree
   inspect    Inspect bundles or distributor state
+  manifest   Create source bundle manifests
 
 Use "%s <command> --help" for command-specific help.
 `, app.Name, app.Name, app.Name)