I am trying to set up a substitute server. The substitute server starts fine with this command `guix publish --user=username --compression=gzip:9 --compression=zstd:9 --compression=lzip:9 --cache=/home/username/publish-cache/ --cache-bypass-threshold=0 --public-key=/etc/guix/signing-key.pub --private-key=/etc/guix/signing-key.sec`.
On another computer I have run `guix archive --authorize < <substitute-server-public-key>`. When I try to run `guix pull --url=<substitute-server-address>:<port>` I get this error "guix pull: error: Git error: error authenticating: no auth sock variable".
