prometheus: use basic auth secrets

black-start/services/prometheus/docker-compose.yaml

@@ -7,6 +7,7 @@ services:
     ports:
       - 9090:9090
     volumes:
+      - ./.basicauthpass:/etc/prometheus/.basicauthpass
       - ./prometheus.yaml:/etc/prometheus/prometheus.yaml
       - ./web-config.yaml:/etc/prometheus/web-config.yaml
       - prometheus-data:/prometheus

black-start/services/prometheus/prometheus.yaml

@@ -27,3 +27,6 @@ scrape_configs:
 
     static_configs:
       - targets: ["localhost:9090"]
+    basic_auth:
+      username: prometheus
+      password_file: /etc/prometheus/.basicauthpass