Почему в App Engine нет драйверов для SQL Server?

Я пытаюсь установить драйверы SQL Server в пользовательскую среду выполнения для PHP на App Engine Flex.
Если я не укажу в файле conf Nginx, он загрузит страницу исправления index.php (это приложение Laravel). Без какого-либо файла конфигурации Nginx он будет искать index.php в корне моего приложения. Мой вопрос: как App Flex Engine обрабатывает пользовательские среды выполнения PHP? Нужен ли мне файл nginx.conf? Я получаю адрес, уже связанный ошибка.

Вот мой Dockerfile;

FROM gcr.io/google-appengine/php
RUN mkdir -p /usr/share/nginx/www/
ADD . /usr/share/nginx/www/
RUN chmod -R a+r /usr/share/nginx/www

RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add -
RUN apt-get update && apt-get -y install apt-transport-https curl
RUN curl https://packages.microsoft.com/config/debian/9/prod.list > /etc/apt/sources.list.d/mssql-release.list
RUN exit
RUN apt-get update -y
RUN ACCEPT_EULA=Y apt-get install msodbcsql17 -y
RUN pecl channel-update pecl.php.net
RUN apt-get install unixodbc-dev -y
RUN apt-get install autoconf -y
RUN apt-get install build-essential -y
RUN apt-get install gcc -y
RUN apt-get install g++ -y
RUN pecl install sqlsrv
RUN pecl install pdo_sqlsrv
RUN echo extension=pdo_sqlsrv.so >> `php --ini | grep "Scan for additional .ini files" | sed -e "s|.*:\s*||"`/30-pdo_sqlsrv.ini
RUN echo extension=sqlsrv.so >> `php --ini | grep "Scan for additional .ini files" | sed -e "s|.*:\s*||"`/20-sqlsrv.ini
RUN mkdir -p /usr/share/nginx/www/_ah && \
echo "healthy" > /usr/share/nginx/www/_ah/health
EXPOSE 8080

и мой файл Nginx

# Copyright 2015 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

events {
worker_connections 768;
}

http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;

# Logs will appear on the Google Developer's Console when logged to this
# directory.
access_log /var/log/app_engine/app.log;
error_log /var/log/app_engine/app.log;

gzip on;
gzip_disable "msie6";

server {
# Google App Engine expects the runtime to serve HTTP traffic from
# port 8080.
listen 8080;
root /usr/share/nginx/www/public;
index index.html index.htm index.php;
location / {
try_files $uri?$args $uri/index.php?$args;
}
}
}