Dockerfile base part separate to base image (#17701)

Unify open-source and closed-source Dockerfile expect nginx
1. per install tools to base image
2. fix copy nginx config
3. fix copy entrypoint*.sh
4. fix go ci error
5. add comment

docker/entrypoint.sh

@@ -280,7 +280,7 @@ fi
 
 if [[ "${ENABLE_WEBSERVER}" -eq 1 ]]; then
     echo "Starting nginx..."
-    /usr/sbin/nginx
+    /usr/sbin/nginx -c /etc/nginx/nginx.conf
 
     if [[ "${API_PROXY_SCHEME}" == "hybrid" ]] || [[ "${API_PROXY_SCHEME}" == "python" ]]; then
         while true; do