환경변수 추가 (#548)

Author: Chehyeon-Kim23

docker/docker-compose.yml

@@ -396,6 +396,7 @@ services:
     ports:
       - "9093:9093"
     environment:
+      - SLACK_WEBHOOK_URL=${SLACK_WEBHOOK_URL}
     volumes:
       - ./monitoring/alertmanager/alertmanager.yml:/etc/alertmanager/alertmanager.yml:ro
       - alertmanager_data:/alertmanager
@@ -461,4 +462,4 @@ volumes:
   redis-node-6-data:
   prometheus_data:
   grafana_data:
-  alertmanager_data:
+  alertmanager_data: