Enable password-protected Redis by default

[crenshaw-dev]

Summary

Enable password-protected Redis by default.

Motivation

Password-protecting Redis is currently an undocumented feature. Adding password protection provides an additional layer of security to protect cached information (e.g. rendered manifests) from unauthorized access.

Proposal

Randomly generate a password, and store it in a Secret shared by Redis and its clients (application-controller and repo-server if I recall correctly).

[rowanmoul]

As noted in the above linked issue, this has been completed!