Zstd dictionaries for Fedora's metadata
To generate dictionaries for a specific release, copy its zchunked metadata
into dicts/$PLATFORM_ID/repodata (where $PLATFORM_ID comes from
/etc/os-release) and then run
./create_zdicts.sh dicts/$PLATFORM_ID
To install all the dictionaries to /usr/share/fedora-repo-zdicts, run
make install