add missing fromImage build arg

Author: gosurya-oracle

src/main/java/com/oracle/weblogicx/imagebuilder/cli/menu/CreateImage.java

@@ -81,6 +81,8 @@ public CommandResponse call() throws Exception {
             cmdBuilder.addAll(handleInstallerFiles(tmpDir));
 
             if (fromImage != null && !fromImage.isEmpty()) {
+                cmdBuilder.add(BUILD_ARG);
+                cmdBuilder.add("BASE_IMAGE=" + fromImage);
 
                 tmpDir2 = Files.createTempDirectory(Paths.get(System.getProperty("user.home")),
                     "wlsimgbuilder_temp");