git: update gitignore
git: update gitignore

* ignore `*.retry` files in general

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

font/ceph-ansible,guits/ceph-ansible,bengland2/ceph-ansible,ceph/ceph-ansible,font/ceph-ansible,fgal/ceph-ansible,jtaleric/ceph-ansible,WingkaiHo/ceph-ansible,WingkaiHo/ceph-ansible,albertomurillo/ceph-ansible,albertomurillo/ceph-ansible,guits/ceph-ansible,travmi/ceph-ansible,albertomurillo/ceph-ansible,bengland2/ceph-ansible,travmi/ceph-ansible,jtaleric/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,WingkaiHo/ceph-ansible