cicd: added gitlab-ci

.gitlab-ci.yml

+image: node
+
+stages:
+ - deploy
+
+deploy_staging:
+  stage: deploy
+  environment: staging
+  script:
+    - npm install
+    - echo $APP_CONFIG
+    - echo $APP_CONFIG > config.json
+    - npm run build
+    - echo $SSH_PRIAVTE_KEY > gitlab.key
+    - scp -i gitlab.key -r build/* test-paris@ssh-test-paris.happy-dev.fr:~/staging/www/
+  only:
+    - feat/manager_deploy