Merge pull request #2528 from flatcar/chewi/shim-review-nobble

prod_image_util.sh: Temporarily nobble removing unsigned kernel and GRUB

Author: chewi

build_library/prod_image_util.sh

@@ -182,6 +182,8 @@ EOF
 
   # Official builds will sign and upload these files later, so remove them to
   # prevent them from being uploaded now.
+  # TODO: Un-nobble this later when we have passed the shim review.
+  false && \
   if [[ ${COREOS_OFFICIAL:-0} -eq 1 ]]; then
     rm -v \
         "${BUILD_DIR}/${image_kernel}" \