The RHELAI container images have started to define the DNF var releasever, e.g. https://gitlab.com/redhat/rhel-ai/containers/instructlab-nvidia/-/merge_requests/410 . The releasever var is one of five hard-coded variables. The variable must not be modified by users. DNF reads the variable from RPMDB (e.g. from redhat-release package).

To Reproduce Steps to reproduce the behavior:

$ grep -R /etc/dnf/vars/releasever */Containerfile
amd-bootc/Containerfile:    && echo "9.4" > /etc/dnf/vars/releasever
amd-bootc/Containerfile:    && echo "9.4" > /etc/dnf/vars/releasever
instructlab-nvidia/Containerfile:    && echo "9.4" > /etc/dnf/vars/releasever
nvidia-bootc/Containerfile:    && echo "9.4" > /etc/dnf/vars/releasever

Expected behavior

• No container file attempts to modify releasever through /etc/dnf/vars.

Additional context

• https://dnf.readthedocs.io/en/latest/conf_ref.html#repo-variables