switching to alpine PHP for speed

.gitlab-ci.yml

@@ -1,9 +1,8 @@
-image:            php:7.0
+image:          php:7.1-alpine
 
 before_script:
-  # Install dependencies
   - bash ci/docker_install.sh > /dev/null
 
 test:local:
   script:
-    - composer.phar test-local
+    - php composer.phar test-local

ci/docker_install.sh

@@ -6,13 +6,13 @@
 set -xe
 
 # Install git (the php image doesn't have it) which is required by composer
-apt-get update -yqq
-apt-get install git -yqq
-
-# 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
+apk update
+apk add git
 
 # Install mysql driver
 # Here you can install any other extension that you need
 docker-php-ext-install pdo_mysql pdo_sqlite
+
+# Install composer
+curl -sS https://getcomposer.org/installer | php
+php composer.phar install