Add a gitlab-ci file

So far this should not work as the test are not in this branch and the
image is not yet on the registry.

First tests should be implemented in tuleap-40

.gitlab-ci.yml

+image:
+  name: registry.gitlab.tetras-libre.fr/rekall/Memorekall-member-new
+  entrypoint: [""]
+
+variables:
+  MYSQL_USER: rekall
+  MYSQL_DATABASE: rekall_test
+  MYSQL_PASSWORD: rekall
+  MYSQL_RANDOM_ROOT_PASSWORD:  ok
+  TZ: "Europe/Paris"
+  PHP_INI_DATE_TIMEZONE: "Europe/Paris"
+
+
+.cache_template: &cache
+  cache:
+    key: rekall-global-cache-key
+    paths:
+        - $CI_PROJECT_DIR/vendor/
+        - $CI_PROJECT_DIR/node_modules/
+
+.before_script_template: &install_deps
+  before_script:
+      - cd $CI_PROJECT_DIR
+      - cp .env.test .env
+      - composer install
+      - npm install
+
+codeception:
+  stage: test
+  <<: *install_deps
+  <<: *cache
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+    - if: '$CI_COMMIT_MESSAGE =~ /test/'
+    - if: '$CI_COMMIT_BRANCH  =~ /test/ || $CI_COMMIT_BRANCH == "production" || $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+  script:
+    - php vendor/bin/phpunit
+  artifacts:
+    when: always
+    expire_in: 1 week
+    paths:
+      - tests/_output
+  services:
+    - mysql

[Ghost User]

This commit references: TULEAP-40.