flake8: run the workflow conditionally
flake8: run the workflow conditionally

We don't need to run flake8 on ansible modules and their tests if we
don't have any modifitions.

Signed-off-by: Dimitri Savineau <a50a620e679eed14f4e99998b821cea8884cf228@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible