SKIP UPDATE CHECK Resolve "Loki log retention set forever"

General MR

Summary

Set default "prod" log retention to 1y.

Relevant logs/screenshots

N/A

Linked Issue

#190 (closed)

Upgrade Notices

By default, Loki retains logs FOREVER. To change this functionality for your own deployment, please set your retention_period as shown in values.yaml on line 306.