Fix cascade diff

.github/scripts/build-images.sh

@@ -18,16 +18,20 @@ if [ -z "$modified_files" ]; then
 else
     echo "Checking against modified files"
 fi
+
 # 3.Find out whether the files related with the current build were modified or not
 if (grep -q "${DF_PATH#./}" <<<$modified_files) || # Rebuild the image if any file in the build folder is changed 
     (grep -q "build-images.sh" <<<$modified_files) ||
-    (grep -q "build-images.yaml" <<<$modified_files); then
+    (grep -q "build-images.yaml" <<<$modified_files) ||
+    [ "${IS_PARENT_MODIFIED}" = "true" ]; then
     # if modified, then rebuild their docker image
     docker buildx prune -a -f
     # reference: https://github.com/docker/buildx/issues/495
     docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
     docker buildx create --name multiarch --driver docker-container --use
     docker buildx inspect --bootstrap
+
+    echo "MODIFIED=true" >> $GITHUB_ENV
 
     if [ $image_name = "debian" ]; then
         cd commons/base-os