Gitlab Ci configuration for simple PHP projects

.gitlab-ci.yml

before_script:
# Install dependencies
- sh docker_install.sh > /dev/null

cache:
  paths:
  - vendor/

php:7.1:
  image: php:7.1-alpine
  script:
  - phpunit --configuration phpunit.xml

php:7.2:
  image: php:7.2-alpine
  script:
  - phpunit --configuration phpunit.xml

docker_install.sh

#!/bin/sh

# We need to install dependencies only for Docker
[[ ! -e /.dockerenv ]] && exit 0

set -xe

# Install git (the php image doesn't have it) which is required by composer
apk update
apk add git

# Install phpunit, the tool that we will use for testing
curl --location --output /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
chmod +x /usr/local/bin/phpunit

# Install composer dependencies
apk add wget
wget https://composer.github.io/installer.sig -O - -q | tr -d '\n' > installer.sig
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === file_get_contents('installer.sig')) { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php'); unlink('installer.sig');"
php composer.phar install -q