Host images in a public registry

[alex-vg]

Problem
Docker images live only on docker.wdf.sap.corp:51689, so external customers and CI pipelines can’t pull them without VPN.

Proposal
Publish images to a public registry (e.g. ghcr.io/SAP/fundamental-tools or Docker Hub).

Benefits

• Zero‑VPN onboarding for users and CI
• Easier community contributions and testing
• Public vulnerability scans and metrics

Next Steps

1. Add a CI job to push images to the chosen public registry
2. Update documentation with new image URLs
3. Phase out the intranet‐only registry