NGINX / htaccess woes

Hey all.

We are moving from an Apache setup to a NGINX setup (under a dockerised environment)
and struggling to get CI 3.1.5 to work properly.

Has anyone ever got CI working correctly under NGINX.
I'm pretty sure it's to do with converting htaccess rules to their NGNIX equivalents.

Here is my vhost configuration so far :-


server {
        listen 80;
        listen [::]:80;

        root /app/staging;
        index index.php;

        server_name _;

                location / {
                        if (!-e $request_filename) {
                                rewrite ^(.*)$ /index.php?/$1
                                break;
                        }
                }

        location / {
                try_files $uri $uri/ =404;
        }

        # set expiration of assets to MAX for caching
        location ~* \.(ico|css|js|gif|jpe?g|png)(\?[0-9]+)?$ {
                expires max;
                log_not_found off;
        }

        location ~* \.php$ {
                fastcgi_pass php5:9000;
                include fastcgi.conf;
        }

        location ~ /\.ht {
                deny all;
        }
}

Does anyone have any experience with this as the rewrite rules are not passing the path info over to index.php correctly and not sure how to diagnose.

Thanks in advance.
Phil.