Added support for GitLab CI

ci/docker_install.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# From https://docs.gitlab.com/ee/ci/examples/php.html
+
+# 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
+apt-get update -yqq
+apt-get install git wget unzip -yqq
+
+# Install & enable Xdebug for code coverage reports
+pecl install xdebug
+docker-php-ext-enable xdebug
+
+# Install composer dependencies
+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