saving container image optional

Signed-off-by: HIHIA <[email protected]>

Author: YTGhost

Diff for: cmd/sealer/cmd/image/build.go

@@ -92,6 +92,7 @@ func NewBuildCmd() *cobra.Command {
 	buildCmd.Flags().StringSliceVar(&buildFlags.Annotations, "annotation", []string{}, "add annotations for image. Format like --annotation key=[value]")
 	buildCmd.Flags().StringSliceVar(&buildFlags.Labels, "label", []string{getSealerLabel()}, "add labels for image. Format like --label key=[value]")
 	buildCmd.Flags().BoolVar(&buildFlags.NoCache, "no-cache", false, "do not use existing cached images for building. Build from the start with a new set of cached layers.")
+	buildCmd.Flags().BoolVarP(&buildFlags.DownloadContainerImage, "download-container-image", "lite", true, "save the container image generated during the build process.")
 
 	supportedImageType := map[string]struct{}{v12.KubeInstaller: {}, v12.AppInstaller: {}}
 	if _, ok := supportedImageType[buildFlags.ImageType]; !ok {
@@ -160,13 +161,15 @@ func buildSealerImage() error {
 	}
 
 	defer func() {
-		for _, m := range []string{tempTag} {
-			// the above image is intermediate image, we need to remove it when the build ends.
-			if err := engine.RemoveImage(&bc.RemoveImageOptions{
-				ImageNamesOrIDs: []string{m},
-				Force:           true,
-			}); err != nil {
-				logrus.Debugf("failed to remove image %s, you need to remove it manually: %v", m, err)
+		if buildFlags.DownloadContainerImage {
+			for _, m := range []string{tempTag} {
+				// the above image is intermediate image, we need to remove it when the build ends.
+				if err := engine.RemoveImage(&bc.RemoveImageOptions{
+					ImageNamesOrIDs: []string{m},
+					Force:           true,
+				}); err != nil {
+					logrus.Debugf("failed to remove image %s, you need to remove it manually: %v", m, err)
+				}
 			}
 		}
 	}()

Diff for: pkg/define/options/options.go

@@ -16,22 +16,23 @@ package options
 
 // BuildOptions should be out of buildah scope.
 type BuildOptions struct {
-	Kubefile          string
-	ContextDir        string
-	PullPolicy        string
-	ImageType         string
-	Manifest          string
-	Tag               string
-	BuildArgs         []string
-	Platforms         []string
-	Labels            []string
-	Annotations       []string
-	NoCache           bool
-	Base              bool
-	Tags              []string
-	Platform          string
-	ImageList         string
-	ImageListWithAuth string
+	Kubefile               string
+	ContextDir             string
+	PullPolicy             string
+	ImageType              string
+	Manifest               string
+	Tag                    string
+	BuildArgs              []string
+	Platforms              []string
+	Labels                 []string
+	Annotations            []string
+	NoCache                bool
+	Base                   bool
+	Tags                   []string
+	Platform               string
+	ImageList              string
+	ImageListWithAuth      string
+	DownloadContainerImage bool
 }
 
 type FromOptions struct {