What causes errors when building lemp via docker-compose?

Question

PHP

Yesterday I did the assembly according to this manual . All earned.
Today I'm booting up - it doesn't want to assemble ... It gives out:

If you remove mysql-client from the dockerfile, the installation will continue, but then it will be interrupted again with an error:

Dockerfile:

FROM php:7.2-fpm

# Set working directory
WORKDIR /var/www

# Install dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    mysql-client \
    libpng-dev \
    libjpeg62-turbo-dev \
    libfreetype6-dev \
    locales \
    zip \
    jpegoptim optipng pngquant gifsicle \
    vim \
    unzip \
    git \
    curl

# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*

# Install extensions
RUN docker-php-ext-install pdo_mysql mbstring zip exif pcntl mysqli
RUN docker-php-ext-configure gd --with-gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ --with-png-dir=/usr/include/
RUN docker-php-ext-install gd

# Install composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

# Add user for laravel application
RUN groupadd -g 1000 www
RUN useradd -u 1000 -ms /bin/bash -g www www

# Copy existing application directory contents
COPY ./www /var/www

# Copy existing application directory permissions
COPY --chown=www:www ./www /var/www

# Change current user to www
USER www

# Expose port 9000 and start php-fpm server
EXPOSE 9000
CMD ["php-fpm"]

docker-compose.yml:

version: '3'
services:

  #PHP Service
  app:
    build:
      context: .
      dockerfile: Dockerfile
    image: digitalocean.com/php
    container_name: laravel.php
    restart: always
    tty: true
    environment:
      SERVICE_NAME: app
      SERVICE_TAGS: dev
    working_dir: /var/www
    volumes:
      - ./www:/var/www
      - ./config/php/local.ini:/usr/local/etc/php/conf.d/local.ini
    networks:
      - app-network

  #Nginx Service
  webserver:
    image: nginx:alpine
    container_name: laravel.nginx
    restart: always
    tty: true
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./www:/var/www
      - ./config/conf.d/:/etc/nginx/conf.d/
    networks:
      - app-network

  #MySQL Service
  db:
    image: mysql:5.7.22
    container_name: laravel.db
    restart: always
    tty: true
    ports:
      - "3306:3306"
    environment:
      MYSQL_ROOT_PASSWORD: 0
      MYSQL_DATABASE: laravel
      MYSQL_USER: laravel
      MYSQL_PASSWORD: laravel
      SERVICE_TAGS: dev
      SERVICE_NAME: mysql
    volumes:
      - ./db:/var/lib/mysql/
      - ./config/mysql/my.cnf:/etc/mysql/my.cnf
    networks:
      - app-network

  phpmyadmin:
    image: phpmyadmin/phpmyadmin
    container_name: laravel.pma
    environment:
      - PMA_ARBITRARY=1
    restart: always
    ports:
      - 8080:80
    environment:
      MYSQL_ROOT_PASSWORD: 0
      MYSQL_USER: pma
      MYSQL_PASSWORD: pma
    volumes:
      - /sessions
    networks:
      - app-network

#Docker Networks
networks:
  app-network:
    driver: bridge

Answer 1

I checked - it's not your fault, it's the creators of PHP image that broke something in the latest version.
Replace the first line in the Dockerfile with:
FROM php:7.2.3-fpm