Container Build / Dockerfile: Switch to s2i-Images

[freinold]

The current container build uses Vanilla Images for nodejs and Python Runtime.

Especially the Python-Image could be resolved differently if another Image Registry is used and can thus be a source of vulnerability.

To better support future K8s/OpenShift-Deployment, switch to s2i (source2image) for nodejs and Python.
To ensure full OpenSource-Compatability, dont use the RHEL images / Dockerfiles, but the CentOS based ones instead.
Also try to build on the minimal image which could shrink size and thus save storage and build/load times.

[github-actions]

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