Additional trusted certificates for S3 endpoint

[dimitarvdimitrov]

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

My s3-compatible storage is running with self-signed certificates. Right now I am running Mimir with insecure_skip_verify: true on the bucket configs. I would like to stop this practice and run it with SSL/TLS verification.

Describe the solution you'd like

Be able to provide trusted certs in the configuration of Mimir and have insecure_skip_verify: false

Describe alternatives you've considered

Put the certificates in a well-known cert location on linux according to https://go.dev/src/crypto/x509/root_linux.go

While it should work, this isn't documented anywhere.

Additional context

Deploying this via the helm chart, so it would also be nice to support the added config option there too.