[CI] Simplify & optimize CI configuration

.gitlab-ci.yml

@@ -1,38 +1,21 @@
 image: php:latest
 
-# Select what we should cache between builds
+services:
+  - mariadb:latest
+
 cache:
   paths:
     - vendor/
 
 before_script:
-  - apt-get update -yqq
-  # libzip-dev is required but not included in default template
-  - apt-get install -yqq git libmcrypt-dev libpq-dev libcurl4-gnutls-dev libicu-dev libvpx-dev libjpeg-dev libpng-dev libxpm-dev zlib1g-dev libfreetype6-dev libxml2-dev libexpat1-dev libbz2-dev libgmp3-dev libldap2-dev unixodbc-dev libsqlite3-dev libaspell-dev libsnmp-dev libpcre3-dev libtidy-dev libzip-dev unzip
-  # Install PHP extensions
-  # mcrypt broken but included in default template:
-  # > $ docker-php-ext-install mbstring mcrypt pdo_pgsql curl json intl gd xml zip bz2 opcache
-  # > error: /usr/src/php/ext/mcrypt does not exist
-  # mbstring broken because dependencies not included in default template:
-  # > $ docker-php-ext-install mbstring pdo_pgsql curl json intl gd xml zip bz2 opcache
-  # > No package 'oniguruma' found
+  - apt update -yqq
+  - apt install -yqq git libmcrypt-dev libcurl4-gnutls-dev libexpat1-dev libxml2-dev libpcre3-dev unzip libzip-dev zlib1g-dev libbz2-dev
   - docker-php-ext-install pdo_mysql intl curl zip bz2
-  # Install & enable Xdebug for code coverage reports
-  - pecl install xdebug
-  - docker-php-ext-enable xdebug
-  # Install and run Composer
   - curl -sS https://getcomposer.org/installer | php
   - php composer.phar install
 
-# Bring in any services we need http://docs.gitlab.com/ee/ci/docker/using_docker_images.html#what-is-a-service
-# See http://docs.gitlab.com/ce/ci/services/README.html for examples.
-services:
-  - mariadb:latest
-
-# Set any variables we need
 variables:
   COMPOSER: 'inc/test/composer.json'
-  # Configure mysql environment variables (https://hub.docker.com/r/_/mysql/)
   MYSQL_HOST: mariadb
   MYSQL_DATABASE: mysql_database
   MYSQL_USERNAME: root
@@ -40,8 +23,6 @@ variables:
   MYSQL_ROOT_PASSWORD: mysql_strong_password
   LITEBANS_TABLE_PREFIX: test_
 
-# Run our tests
-# If Xdebug was installed you can generate a coverage report and see code coverage metrics.
 test:
   script:
     - ./vendor/bin/phpunit inc/test/php