cicd: restricted permission on key

.gitlab-ci.yml

@@ -9,6 +9,7 @@ deploy_staging:
   script:
     - echo $APP_CONFIG > config.json
     - echo $SSH_PRIVATE_KEY > gitlab.key
+    - chmod 600 gitlab.key
     - npm install
     - npm run build
     - scp -i gitlab.key -o StrictHostKeyChecking=no -r build/* test-paris@ssh-test-paris.happy-dev.fr:~/staging/www/