Describe the bug
When running Loki with mTLS (RequireAndVerifyClientCert), or even with VerifyClientCertIfGiven, the UI stops working. All static assets load, but no nodes are discovered and the version number is not disabled.

The cause seems to be the hard-coded proxyScheme in https://github.com/grafana/loki/blob/main/pkg/ui/handler.go#L27, there is no way to change it from http to https via config.

To Reproduce
Steps to reproduce the behavior:

1. Started Loki 3.6.2 via the official Helm chart
2. Go to /ui

Expected behavior
UI should work.

Environment:

• Infrastructure: Kubernetes
• Deployment tool: Helm