Launch me with systemd socket activation for FastCGI, or else set $PORT
for HTTP listener (currently broken).

Write your Caddyfile:

    root /whatever
    @zip {
        path *.zip/*
        path *.zip
    }
    reverse_proxy @zip {
        to unix/@zipfs
        transport fastcgi {
            split .zip
        }
    }
    file_server {
        browse
        precompressed
    }

You might think that the file_server directive is entirely unrelated to this
server, that it just seems like a good idea to configure them with the same
document root, but actually you need it so script_filename is correct.

Some zip files (looking at you, duckdb-docs) include absolute URLs and expect
to be unpacked and then served at a root. In this case you can't rely on
fastcgi to split on .zip. Maybe configure the HTTP listener to add and remove
a custom prefix.

Build and install:

    go install
    install ~/.asdf/installs/golang/1.24.5/packages/bin/zipfs ~/bin/ 

Do `systemctl --user edit --full --force zipfs.socket`:

    [Socket]
    ListenStream=@zipfs

    [Install]
    WantedBy=sockets.target

Do `systemctl --user edit --full --force zipfs.service`:

    [Service]
    ExecStart=/home/josh/bin/zipfs --index=index.html

Fire it up:

    systemctl --user enable zipfs.socket
    systemctl --user start zipfs.socket