Update gitlab ci build to include installation of sqlite3

.gitlab-ci.yml

@@ -7,6 +7,7 @@ services:
     - postgres:latest
 
 variables:
+    MYSQL_ROOT_PASSWORD: foo-bar-baz
     MYSQL_DATABASE: test
     MYSQL_USER: test
     MYSQL_PASSWORD: test

build/docker_install.sh

@@ -7,7 +7,7 @@ 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
+apt-get install git sqlite -yqq
 
 # Install phpunit, the tool that we will use for testing
 curl -Lo /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar