This fixes the issue that we only supplied one platform in ghcr.io
instead of both.

The reason for that is that we have overridden the previously tag with
the one that took the longest to build. Which usually was aarch64.

Additionally this commit moves away from utilizing the greenbone.net
docker proxies in favor of using ghcr where possible so that our
critical pipelines hopefully run more stable.

The downside of that change is that building images currently takes a
longer time than previously because we cannot use the previously build
assets anymore.

Add the dynamically linked C libraries required by the prebuilt
openvasd and scannerctl Linux binaries to their README files.

The dependencies were determined from the release artifacts using
readelf -d ... | grep NEEDED to clarify which runtime libraries must
be present on target systems.

In case two RPM versions are compared and have a different separator they are checked lexicographical.
In reality they should not be compared and are interchangable.
To solve issues with this, we now normalize the version string to only contain a single '.' as a separator.