Add GitLab CI

• Different set of boxes, there isn't a 7.2 in the current series and doesn't seem like that'll changes
• Correct PHPUnit version for PHP version, as Travis handles

Fixes #2 (closed)

.gitlab-ci.yml

@@ -12,7 +12,7 @@ before_script:
 
   # install the required packages for the running CI tests
   - |
-    apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev --fix-missing
+    apt-get -yqqf install lsb-release zip unzip subversion mysql-client libicu-dev libpng-dev libbz2-dev --fix-missing
 
     if [[ $(lsb_release -a) =~ "stretch" ]]; then
       apt-get -yqqf install default-libmysqlclient-dev --fix-missing
@@ -26,6 +26,8 @@ before_script:
 
   # Install Composer
   - curl -sS https://getcomposer.org/installer | php
+  - mv composer.phar /usr/local/bin/composer
+  - export PATH="$HOME/.composer/vendor/bin:$PATH"
 
   # Set up WordPress tests
   - bash bin/install-wp-tests.sh $MYSQL_DATABASE root $MYSQL_ROOT_PASSWORD mysql latest true
@@ -33,13 +35,13 @@ before_script:
   # PHPUnit
   - |
     if [[ $(php -v) =~ "PHP 7." ]]; then
-      php composer.phar global require "phpunit/phpunit=6.1.*"
+      composer global require "phpunit/phpunit=6.1.*"
     else
-      php composer.phar global require "phpunit/phpunit=4.8.*"
+      composer global require "phpunit/phpunit=4.8.*"
     fi
 
   # Install PHPCS and WPCS
-  - php composer.phar global require automattic/vipwpcs
+  - composer global require automattic/vipwpcs
   - phpcs --config-set installed_paths $HOME/.composer/vendor/wp-coding-standards/wpcs,$HOME/.composer/vendor/automattic/vipwpcs
 
 PHPunit:PHP5.3:MySQL: