Docker-环境变量不覆盖php.ini

docker-compose up --build 尝试从浏览器中访问应用程序(index.php)我可以看到env变量没有覆盖php.ini文件或apache conf文件。你知道我做错了什么吗?

这些是我的档案

docker-compose.yml文件

services:
    app:
        container_name: myapp
        build:
            context: .
            dockerfile: docker/Dockerfile
        volumes:
            - .:/var/www/html
        ports:
            - 8080:80
        env_file:
            - ./.env
        networks:
            - appnet

FROM php:7.3-apache-stretch
COPY docker/vhost.conf /etc/apache2/sites-available/000-default.conf
COPY docker/config/php/php.ini /usr/local/etc/php/php.ini
COPY docker/config/php/conf.d/*.ini /usr/local/etc/php/conf.d/
COPY . /var/www/html/
WORKDIR /var/www/html/

php.ini文件

date.timezone = ${PHP_DATE_TIMEZONE}
display_errors = ${PHP_DISPLAY_ERRORS}
error_reporting = ${PHP_ERROR_REPORTING}

.env环境

PHP_DATE_TIMEZONE = Europe/London
PHP_DISPLAY_ERRORS = 1
PHP_ERROR_REPORTING = -1

index.php索引