[fix] Docker Promtail Unhealthy 문제 해결 (#1099)

* fix: sync container timezones in promtail for prod and dev environments

* fix: update promtail comment to clarify timestamp configuration

* Update backend/docker/prod/docker-compose.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update backend/docker/dev/docker-compose.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: kiwoook

backend/docker/dev/conf/promtail.yml

@@ -27,8 +27,9 @@ scrape_configs:
       - labels:
           level:
 
+      # promtail이 직접 자신의 시스템 시계를 보고 Loki에게 보내도록 설정
       # 타임스탬프 설정 (KST → UTC 변환)
-      - timestamp:
-          source: timestamp
-          format: '2006-01-02 15:04:05.000'
-          location: Asia/Seoul
+#      - timestamp:
+#          source: timestamp
+#          format: '2006-01-02 15:04:05.000'
+#          location: Asia/Seoul

backend/docker/dev/docker-compose.yml

@@ -190,6 +190,7 @@ services:
     volumes:
       - dev-app-logs:/app/logs:ro
       - ./conf/promtail.yml:/etc/promtail/promtail.yml:ro
+      - /etc/localtime:/etc/localtime:ro
     command: -config.file=/etc/promtail/promtail.yml
     networks:
       - dev-network

backend/docker/prod/docker-compose.yml

@@ -208,6 +208,7 @@ services:
     volumes:
       - prod-app-logs:/app/logs:ro
       - ./conf/promtail.yml:/etc/promtail/promtail.yml:ro
+      - /etc/localtime:/etc/localtime:ro
     command: -config.file=/etc/promtail/promtail.yml
     networks:
       - prod-network