Versioneer requires a lot of useless info

[Itxaka]

Current versioneer requries a lot of stuff to be run, which is not expected:

FLAVOR_RELEASE=36
FLAVOR="fedora"
TARGETARCH="amd64"

This should be autofilled by getting it from the running system /etc/os-release as we run the versioneer in the final image, we should get that info by default.

Would even go further and say that family, as its set by ourselves, should also be inferred by the agent directly based on the flavor.

So ideally the only thing you need for the versioneer is the minimal set that we dont know yet:
REGISTRY_AND_ORG
MODEL
VARIANT