Provide /etc/os-release for rhel6 builder image
Provide /etc/os-release for rhel6 builder image
This should increase compatibility with toolbx [1][2].
[1] https://github.com/containers/toolbox/pull/1475
[2] https://gitlab.com/redhat/rhel/sst/kernel-maintainers/docs/-/merge_requests/67
Edited by Michael Hofmann