Failed build still pushed to prod

[runleveldev]

The build action for the Webchart Docs sites had a transient failure in this action https://github.com/mieweb/docs/actions/runs/20469041187/job/58819806810

Rerunning the job succeeded. But between the first and the manual run the site was down because the failed build got pushed to the server. There should be a safe-guard in place so that if the build fails the whole Action fails and the deployment stops.