upload-to-storage: do not upload the content store

it's pretty much unnecessary for the storage use case and wouldn't work
very well anyway what with each upload having a different path

upload-to-storage.sh

@@ -4,6 +4,8 @@
 
 set -eu
 
+# Do not blow the lid off the storage for now. Reset the tree and only publish a select few files
+rm -rf upload-tree
 if [ ! -d upload-tree ]; then
     mkdir upload-tree
     for f in *.raw *.erofs *.efi; do