nixguix: Make nar ignore .git folder like the guix hash command
$ guix hash -S nar -f base32 -H sha256 -x guix-modules bd4jxucj7hqpvjv5646rxehevbia6gnym7y4kebj4cm3eugdwpma $ python -m nar -f base32 -H sha256 guix-modules bd4jxucj7hqpvjv5646rxehevbia6gnym7y4kebj4cm3eugdwpma==== $ guix hash -S nar -f base32 -H sha256 -x ~/repo/public/linux o3kzi5wtzct2roz4hprvmosv6te43kt5ha6vzefk2mmr5fybm2ua $ python -m nar -f base32 -H sha256 ~/repo/public/linux o3kzi5wtzct2roz4hprvmosv6te43kt5ha6vzefk2mmr5fybm2ua====
Related to T4538#93319