Thanks for the pointers.  This seems to work for cloning the mirror
repo when the main repo is unavailable for retrieving scripts:

git clone https://mirror.git.trinitydesktop.org/gitea/TDE/tde
git clone https://mirror.git.trinitydesktop.org/gitea/TDE/scripts
cd tde
../scripts/switch_all_submodules_to_head_and_clean anonymous
rm -rf ../scripts

--Mike