OCPBUGS-63326: Indicate successful boot artifact downloads

In the event the step processor creates this step more than
once, we don't want to redo any of the previous steps so
we should indicate if it's already successful.

Author: CrystalChun

src/commands/actions/download_boot_artifacts_cmd.go

@@ -79,6 +79,11 @@ initrd %s`
 )
 
 func run(infraEnvId, downloaderRequestStr, caCertPath string) error {
+	if _, err := os.Stat(path.Join(tempBootArtifactsFolder, "boot_artifacts_moved")); err == nil {
+		log.Info("Boot artifacts already successfully downloaded")
+		return nil
+	}
+
 	var req models.DownloadBootArtifactsRequest
 	if err := json.Unmarshal([]byte(downloaderRequestStr), &req); err != nil {
 		return fmt.Errorf("failed unmarshalling download boot artifacts request: %w", err)
@@ -335,7 +340,10 @@ func moveFilesToBootFolder(folders *folders) error {
 		return fmt.Errorf("failed moving files from %s to %s: %w", tempBootArtifactsFolder, folders.bootLoaderFolder, err)
 	}
 
-	log.Infof("Successfully moved files to /boot folder.")
+	log.Info("Successfully moved files to /boot folder.")
+	if err := os.WriteFile(path.Join(tempBootArtifactsFolder, "boot_artifacts_moved"), []byte("true"), 0644); err != nil {
+		return fmt.Errorf("failed to write successful artifacts file: %w", err)
+	}
 	return nil
 }