ci: place the markdown linter rule to restrict the line length at 80
ci: place the markdown linter rule to restrict the line length at 80

This try to enforce the markdown rule for the line length to 80

Signed-off-by: Humble Chirammal <dc8ba7e82a7df22725dedec9b10c7aaab9ec713f@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi