Example of a Laravel multi-stage build

Dockerfile

FROM composer:1.7 as vendor

COPY database/ database/

COPY composer.json composer.json
COPY composer.lock composer.lock

RUN composer install \
    --ignore-platform-reqs \
    --no-interaction \
    --no-plugins \
    --no-scripts \
    --prefer-dist

#
# Frontend
#
FROM node:8.11 as frontend

RUN mkdir -p /app/public

COPY package.json webpack.mix.js yarn.lock /app/
COPY resources/assets/ /app/resources/assets/

WORKDIR /app

RUN yarn install && yarn production

#
# Application
#
FROM php:7.2-apache-stretch

COPY . /var/www/html
COPY --from=vendor /app/vendor/ /var/www/html/vendor/
COPY --from=frontend /app/public/js/ /var/www/html/public/js/
COPY --from=frontend /app/public/css/ /var/www/html/public/css/
COPY --from=frontend /app/mix-manifest.json /var/www/html/mix-manifest.json