请问有什么困扰吗？

在使用EC2实例上的Docker（docker-compose）构建WordPress时，无法通过Wordpress进行电子邮件发送，用于进行设置更改或查询。

version: '3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:5.6
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress
volumes:
    db_data: {}

由于Docker的WordPress镜像中不包含邮件发送功能（sendmail），因此无法发送邮件。

解决

以下是一种方法，可以安装sendmail来发送邮件，而不使用SMTP服务器。

FROM wordpress:5.6

# sendmailをインストール
RUN apt-get update \
 && apt-get install -y --no-install-recommends sendmail \
 && rm -rf /var/lib/apt/lists/*

# sendmailをphpで使うための設定
RUN echo "sendmail_path=sendmail -t -i" >> /usr/local/etc/php/conf.d/sendmail.ini

# エントリポイントとして使用するスクリプトを作成
RUN echo '#!/bin/bash' >> /usr/local/bin/docker-entrypoint-wrapper.sh \
 && echo 'set -euo pipefail' >> /usr/local/bin/docker-entrypoint-wrapper.sh

# 1. /etc/hostsにコンテナホスト名のlocalhostエントリを作成
RUN echo 'echo "127.0.0.1 $(hostname) localhost localhost.localdomain" >> /etc/hosts' >> /usr/local/bin/docker-entrypoint-wrapper.sh

# 2. sendmailの再起動
RUN echo 'service sendmail restart' >> /usr/local/bin/docker-entrypoint-wrapper.sh

# 3. docker-entrypoint.shを呼ぶ
RUN echo 'exec docker-entrypoint.sh "$@"' >> /usr/local/bin/docker-entrypoint-wrapper.sh \
 && chmod +x /usr/local/bin/docker-entrypoint-wrapper.sh

ENTRYPOINT ["docker-entrypoint-wrapper.sh"]
CMD ["apache2-foreground"]

请提供上述参考代码的中文原生释义。

version: '3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     build:
      context: .
      dockerfile: ./Dockerfile
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
       WORDPRESS_DB_NAME: wordpress
volumes:
    db_data: {}