## Context
bull-mq connection was not working as intended, the connection parameter
was ignored and was falling back to localhost.
This PR should fix the issue by instantiating a IORedis client following
bullmq documentation https://docs.bullmq.io/guide/connections
I also changed cache-storage module to use IORedis client as well to be
more consistent even though it was not necessary there. We could move
that instantiation to a factory class in the future.
## Test
start server + worker with correct port and wrong port with
cache-storage-type memory/redis and queue-type sync/bull-mq
