fx'd bind mount for prometheus config

docker-compose/prometheus-grafana/docker-compose.yml

@@ -14,7 +14,7 @@ services:
     ports:
       - "9090:9090"
     volumes:
-      - /etc/prometheus:/config
+      - /config:/etc/prometheus
       - prometheus-data:/prometheus
     restart: unless-stopped
     command:
@@ -27,4 +27,4 @@ services:
       - "3000:3000"
     volumes:
       - grafana-data:/var/lib/grafana
-    restart: unless-stopped
+    restart: unless-stopped