Dockerfile

FROM alpine:3.8

# make sure you can use HTTPS
RUN apk add --update ca-certificates

# copy public key
ADD https://dl.bintray.com/php-alpine/key/php-alpine.rsa.pub /etc/apk/keys/php-alpine.rsa.pub

# add repositories
RUN echo "http://dl-cdn.alpinelinux.org/alpine/v3.8/main" > /etc/apk/repositories && \
    echo "http://dl-cdn.alpinelinux.org/alpine/v3.8/community" >> /etc/apk/repositories && \
    echo "@php https://dl.bintray.com/php-alpine/v3.8/php-7.2" >> /etc/apk/repositories

# remove cache and tmp files
RUN rm -rf /var/cache/apk/* && \
    rm -rf /tmp/*

# install Ansible, PHP, PHP extensions and necesary packages
RUN apk add --no-cache --update ansible \
    bash \
    curl \
    git \
    libressl \
    nodejs \
    nodejs-npm \
    openssh \
    php7@php \
    php7-apcu@php \
    php7-bcmath@php \
    php7-common@php \
    php7-ctype@php \
    php7-curl@php \
    php7-dev@php \
    php7-dom@php \
    php7-exif@php \
    php7-fpm@php \
    php7-gd@php \
    php7-iconv@php \
    php7-intl@php \
    php7-json@php \
    php7-mbstring@php \
    php7-mysqlnd@php \
    php7-opcache@php \
    php7-openssl@php \
    php7-pcntl@php \
    php7-pdo@php \
    php7-pdo_mysql@php \
    php7-pdo_pgsql@php \
    php7-phar@php \
    php7-posix@php \
    php7-redis@php \
    php7-session@php \
    php7-sockets@php \
    php7-xdebug@php \
    php7-xml@php \
    php7-xsl@php \
    php7-zip@php \
    php7-zlib@php

# create symlink for php7
RUN ln -sf /usr/bin/php7 /usr/bin/php

# install Composer.
RUN curl -sS https://getcomposer.org/installer | php \
  && chmod +x composer.phar && mv composer.phar /usr/local/bin/composer