contruib: ability to set a prefix on backport script
contruib: ability to set a prefix on backport script

When pushing a PR it might be handy to set the [skip ci] flag if we know
upfront the content should not trigger the CI.

Now you can add [skip ci] as $4 in your command line.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

ceph/ceph-ansible,font/ceph-ansible,fgal/ceph-ansible,font/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible