ceph-ansible-galaxy: fix workspace path

ceph-ansible-galaxy: fix workspace path

The current path to execute the script is wrong, see:
bash:
/home/jenkins-build/build/workspace/ceph-ansible-galaxy/contrib/push-roles-to-ansible-galaxy.sh:
No such file or directory

It tries to execute
ceph-ansible-galaxy/contrib/push-roles-to-ansible-galaxy.sh where the
actual script is in
ceph-ansible-galaxy/ceph-ansible/contrib/push-roles-to-ansible-galaxy.sh

This commit fixes this.

Signed-off-by: Sébastien Han <seb@redhat.com>