Bugfix - Skip Dracut Module and Mariner.cfg Update with no Verity Cfg. (#7234)

Co-authored-by: lanzeliu <lanzeliu@microsoft.com>

Author: liulanze

toolkit/tools/pkg/imagecustomizerlib/customizeutils.go

@@ -99,7 +99,7 @@ func doCustomizations(buildDir string, baseConfigPath string, config *imagecusto
 		return err
 	}
 
-	err = enableVerityPartition(imageChroot)
+	err = enableVerityPartition(config.SystemConfig.Verity, imageChroot)
 	if err != nil {
 		return err
 	}

toolkit/tools/pkg/imagecustomizerlib/customizeverity.go

@@ -17,9 +17,13 @@ import (
 	"github.com/microsoft/CBL-Mariner/toolkit/tools/internal/shell"
 )
 
-func enableVerityPartition(imageChroot *safechroot.Chroot) error {
+func enableVerityPartition(verity *imagecustomizerapi.Verity, imageChroot *safechroot.Chroot) error {
 	var err error
 
+	if verity == nil {
+		return nil
+	}
+
 	// Integrate systemd veritysetup dracut module into initramfs img.
 	systemdVerityDracutModule := "systemd-veritysetup"
 	err = buildDracutModule(systemdVerityDracutModule, imageChroot)