Hotfix for error when missing SENTRY_DSN

Also I had to change in CI/CD how SENTRY_DSN was defined: no variable interpolation.

.gitlab-ci.yml

@@ -16,7 +16,6 @@ before_script:
   - chmod 700 ~/.ssh
   - ssh-keyscan $DEPLOY_TARGET_IP_ADDRESS >> ~/.ssh/known_hosts
   - chmod 644 ~/.ssh/known_hosts
-  - printenv
 
 deploy:
   stage: deploy