docker-phpmyadmin/root/defaults/default

#config-v1
server {
        listen 80 default_server;

        server_name _;
        root /app/phpmyadmin;
        index index.php;

        client_max_body_size 0;

        location / {
                try_files $uri $uri/ /index.php?$query_string;
        }

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

        location ~* \.php$ {
                fastcgi_pass 127.0.0.1:9000;
                fastcgi_index index.php;
                fastcgi_split_path_info ^(.+\.php)(.*)$;
                include /etc/nginx/fastcgi_params;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        }
}