Add UI notification in DWH when a new Docker release is available

Implement a simple UI element in the DWH interface (see `UpdateEndpoint`) that informs the user when new Docker image releases are available.

1. Check if DWH is currently running in a Docker Container (an not on an Ubuntu Server)
1. Check for new releases (via GHCR tags)
2. **Optional:** Check for new published images (in case of security updates)
3. Compare current container version (`wildfly`, `database`, `httpd`) with latest available
4. Show non-intrusive notification in the DWH UI if an update is available. A simple icon with hover info is enough. An update feature from within the DWH UI is not desired by the users
5. **Optional:** Include link to changelog or release page