fix: Send data handler output to container logs

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

docker-compose.yml

@@ -58,9 +58,9 @@ services:
       db:
         condition: service_healthy
         restart: true
-    # if the latest `update_camera_*.log` contains "error", fail the healthcheck
+    # if the latest update output contains "error", fail the healthcheck
     healthcheck:
-      test: ["CMD", "sh", "-c", "ls /var/log | grep '^update_camera_' | xargs -I {} sh -c 'grep -q error /var/log/{} || exit 0; exit 1'"]
+      test: ["CMD", "sh", "-c", "test \"$(cat /run/update_camera.status)\" = ok"]
       interval: 10s
       timeout: 5s
       start_period: 30s