Proposed title of this feature request

Support to configure .spec.storage.tls  for AWS storage in Loki

What is the nature and description of the request?

OpenShift is running in Azure and desired to use Azure as object storage where it's configured with a custom CA for accessing to it, then, the Loki components accessing to the object storage are failing with the error:

tls: failed to verify certificate: x509: certificate signed by unknown authority 

Currently, `.spec.storage.tls` is only supported for S3 object storage backend.

This request is similar to the request: https://issues.redhat.com/browse/OBSDA-535 for OpenStack Swift.

Why does the customer need this? (List the business requirements)

Needed to keep the data from Loki in the object storage backend Azure using custom CA.

List any affected packages or components.

LokiStack