INFRA-6468: directory created, needs to populate release/sis

[Martin Desruisseaux]

Hello all

According INFRA-6468 [1], We need to populate the following directory 
with previous releases:

https://dist.apache.org/repos/dist/release/sis

Maybe someone familiar with the Pubsub system could do a better work 
than I could. Is there any volunter for this task?

[1] https://issues.apache.org/jira/browse/INFRA-6468