Resolve GWG-37 "Mimir setup"

Closes GWG-37

prometheus-central/prometheus.yml

@@ -52,6 +52,6 @@ scrape_configs:
       - targets: ["grafana-central:3000"]
   - job_name: minio
     metrics_path: /minio/v2/metrics/cluster
-    scheme: https
+    scheme: http
     static_configs:
       - targets: ["localhost:9000"]