fix: update promtail config volume path in docker-compose.yml

Author: z0z0r4

docker-compose.yml

@@ -64,6 +64,6 @@ services:
     image: grafana/promtail:latest
     volumes:
       - /var/log:/var/log
-      - ./promtail/config.yml
+      - ./promtail/config.yml:/etc/promtail/config.yml
     command: -config.file=/etc/promtail/config.yml
     logging: *loki-logging