Install module

apt update
apt install libnginx-mod-stream

Remove the auto generated soft-link file in /etc/nginx/modules-enabled/ngx_stream_module.so

rm /etc/nginx/modules-enabled/ngx_stream_module.so

Add the following to the TOP of /etc/nginx.conf

load_module /usr/lib/nginx/modules/ngx_stream_module.so;

# Stream for Gitea SSH proxy
stream {
    upstream gitea-ssh-backend {
        server ubuntu-server-docker.lan:222;
    }
    server {
        listen 222;
        proxy_pass gitea-ssh-backend;
    }
}