Feature Request: Add Custom CA for TLS intercepting proxy (mitm Proxy)

[git001]

As I'm not sure if the loki-Team see this as a bug or feature I think a Feature Request is a good start point for a discussion.

Is your feature request related to a problem? Please describe.

There are some Setups out there which intercepts the https connection via a HTTP-Proxy and re-encrypt the traffic.
It would be nice to add an option to add a Trusted-CA Bundle from a file location or ENV Var.
As I have seen that the current proxy library have not such a feature have I add a Issue Feature Request: Add Custom CA for TLS intercepting proxy (mitm Proxy)

This is the code to which I refer to.

loki/pkg/storage/chunk/client/azure/blob_storage_client.go

Line 66 in 0dc9d67

Proxy: ieproxy.GetProxyFunc(),

Describe the solution you'd like
We would like to be able to add a file location or a ENV Var to the Deployment/Pod/Setup where a custom Trusted CA is located so that loki components can use this CA Bundle to interact with a Proxy.

I see there some possible solutions.

• Add that feature in the current used proxy module see Feature Request: Add Custom CA for TLS intercepting proxy (mitm Proxy)
• Switch to another proxy module which is able to work with MITM Proxy, for example https://github.com/elazarl/goproxy or similar modules

Describe alternatives you've considered
We have now created a direct connection for the azure blob storage, because of that is the ingester now able to write logs to azure blob storage.