starting the process of moving manifest mgmt to a dedicated subcommand

modules/build/build.cpp

@@ -91,6 +91,9 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
         case CMD_HELP:
             return cmd_help(argc, argv);
 
+        case CMD_MANIFEST:
+            return cmd_manifest(argc, argv);
+
         case CMD_UNKNOWN:
             default:
                 return cmd_unknown(command, argc, argv);