Convert wordpress/Dockerfile for multi-stage builds

FROM php:7.3-fpm

FROM php:7.3-fpm as deps

LABEL uk.org.kodo.maintainer "Dom Sekotill <dom.sekotill@kodo.org.uk>"

RUN apt-get update \

 && apt-get install -y \

	libgmp10 \

	libjpeg62 \

	libpng16-16 \

    libzip4 \

 &&:

FROM deps as compile

# From the official wordpress docker file (modified):

# ----

# install the PHP extensions we need

RUN apt-get update && apt-get install -y \

RUN apt-get update \

 && apt-get install -y \

	libgmp-dev \

	libjpeg-dev \

	libpng-dev \

	&& rm -rf /var/lib/apt/lists/* \

    libzip-dev \

 && docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr \

	&& docker-php-ext-install gd mysqli opcache gmp

# set recommended PHP.ini settings

# see https://secure.php.net/manual/en/opcache.installation.php

RUN { \

		echo 'opcache.memory_consumption=128'; \

		echo 'opcache.interned_strings_buffer=8'; \

		echo 'opcache.max_accelerated_files=4000'; \

		echo 'opcache.revalidate_freq=60'; \

		echo 'opcache.fast_shutdown=1'; \

		echo 'opcache.enable_cli=1'; \

	} > /usr/local/etc/php/conf.d/opcache-recommended.ini

# ----

ARG wp_version

ARG wp_sha1=

ENV WORDPRESS_VERSION=${wp_version}

 && docker-php-ext-install gd mysqli opcache gmp zip \

 &&:

FROM deps

LABEL uk.org.kodo.maintainer "Dom Sekotill <dom.sekotill@kodo.org.uk>"

COPY --from=compile /usr/local/etc/php /usr/local/etc/php

COPY --from=compile /usr/local/lib/php /usr/local/lib/php

WORKDIR /app

VOLUME /app/wp-content

ENV WORDPRESS_ROOT=/app

ARG wp_version=latest

ARG wp_sha1=

ADD install.sh /install.sh

RUN /install.sh "${wp_version}" "${wp_sha1}" && rm /install.sh

COPY opcache.ini /usr/local/etc/php/conf.d/opcache-recommended.ini

COPY entrypoint.sh /bin/entrypoint

ENTRYPOINT ["/bin/entrypoint"]

}

build() {

	# Get cached version of compile stage from registry if available

	docker_pull ${DOCKER_REPOSITORY}/compile:latest

	# Build compile stage cache, from last cached version if available

	docker_build \

		--target compile \

		--tag ${DOCKER_REPOSITORY}/compile:latest

	docker_push ${DOCKER_REPOSITORY}/compile:latest

	docker_build \

		--build-arg wp_version="${UPSTREAM_VERSION}" \

		--tag $1

# set recommended PHP.ini settings

# see https://secure.php.net/manual/en/opcache.installation.php

opcache.memory_consumption=128

opcache.interned_strings_buffer=8

opcache.max_accelerated_files=4000

opcache.revalidate_freq=60

opcache.fast_shutdown=1

opcache.enable_cli=1