Fix automated deployment error detection

[MantisClone]

Problem

When the automated deployment to production fails, the Github action shows that it succeeded. The Github action should also show failure.

Example: https://github.com/RequestNetwork/invoicing-template/actions/runs/9290745617/job/25567679842
This deployment failed because the EASYPANEL_DEPLOY_KEY_PRODUCTION environment variable was wrong. EasyPanel responded with {"message":"Invalid Token"}. A successful response would have been Deploying...