Provision redis containers
Mastodon, Sentry and Pixelfed require a Redis instance.
For Sentry, it has been configured at d8d30a6b35f4.
This change provisions the container without any effort
to bind a port, as it's intended to be used with a network
or a link.
Like MySQL, it allows to customize the image and version
with the facultative image and version parameters.
Test Plan: Deploy redis container for Sentry on Equatower
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D1984