Reduce amount layers of the docker image (#4448)

* Reduce amount layers of the docker image

* Fix models file name

docker/rootfs/etc/services.d/nginx/run

@@ -1,2 +1,4 @@
-#!/usr/bin/execlineb -P
-/usr/local/nginx/sbin/nginx
+#!/usr/bin/with-contenv bash
+# shellcheck shell=bash
+
+exec nginx