[TASK] Add base gitlab ci composer build (#80)

Co-authored-by: Łukasz Uznański <l.uznanski@macopedia.pl>

.gitlab-ci.yml

@@ -0,0 +1,25 @@
+---
+stages:
+  - build
+
+default:
+  image: php:7.4
+  before_script:
+    - bash .gitlab/build/docker_install.sh > /dev/null
+
+build-composer-dependencies:
+  stage: build
+  variables:
+    COMPOSER_CACHE_DIR: '.composer'
+  script:
+    - COMPOSER_CACHE_DIR=.composer
+      composer install --prefer-dist --no-progress --optimize-autoloader
+  artifacts:
+    when: on_success
+    expire_in: 2 weeks
+    paths:
+      - .Build
+  cache:
+    paths:
+      - .composer
+      - .Build

.gitlab/build/docker_install.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+[[ ! -e /.dockerenv ]] && exit 0
+
+set -xe
+
+apt-get update -yqq
+apt-get install git libzip-dev unzip -yqq
+
+php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/local/bin/ --filename=composer
+chmod +x /usr/local/bin/composer
+
+docker-php-ext-install zip