CRITICAL: This fixes the deployment issue where changes weren't appearing on production
Changes:
- Update docker-compose.prod.yml to use ghcr.io pre-built images instead of local builds
- Fix deployment script to pull latest images rather than building locally
- Add proper GitHub Container Registry authentication
- Remove --build flag that was causing deployment to use stale local code
This should resolve the issue where www.vhtv-stiftung.de wasn't showing the new Verpachtung features.
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