Moved to https://github.com/ten0s/blog-code/tree/main/git-difftool-and-binaries-files

$ git clone https://github.com/ten0s/git-difftool-and-binaries-files
$ cd git-difftool-for-binaries
$ git config --local include.path $PWD/.gitconfig

$ sudo apt install meld pandoc unoconv

Copy git-auto-diff.sh to $PATH and you are all set!