Dockerfile

FROM wordpress:5.0.3-php7.3-apache

### WHATEVER COMES BEFORE ###

EXPOSE 80 443 3306

ENV DEBIAN_FRONTEND noninteractive
ARG DB_ROOT_PASSWORD

RUN apt-get update
RUN apt-get -y install wget lsb-release gnupg

RUN curl -o /tmp/mysql.deb https://dev.mysql.com/get/mysql-apt-config_0.8.12-1_all.deb
RUN echo mysql-apt-config mysql-apt-config/select-server select mysql-5.7 | debconf-set-selections
RUN echo mysql-community-server mysql-community-server/root-pass $DB_ROOT_PASSWORD rot | debconf-set-selections
RUN echo mysql-community-server mysql-community-server/re-root-pass $DB_ROOT_PASSWORD rot | debconf-set-selections
RUN dpkg -i /tmp/mysql.deb

RUN apt-get update
RUN apt-get -y install mysql-server mysql-client

### WHATEVER COMES AFTER ###