Remove remaining ties to nlss/php-nginx:7.4 image

rootfs/etc/nginx/nginxconfig.io/php_fastcgi.conf

@@ -0,0 +1,16 @@
+# 404
+try_files $fastcgi_script_name =404;
+
+# default fastcgi_params
+include fastcgi_params;
+
+# fastcgi settings
+fastcgi_pass		    	php;
+fastcgi_index	  	  	index.php;
+fastcgi_buffers			  8 16k;
+fastcgi_buffer_size		32k;
+
+# fastcgi params
+fastcgi_param DOCUMENT_ROOT		$realpath_root;
+fastcgi_param SCRIPT_FILENAME	$realpath_root$fastcgi_script_name;
+fastcgi_param PHP_ADMIN_VALUE	"open_basedir=$base/:/usr/lib/php/:/tmp/";