fix: pass OmniRoute credentials to cron probe

entrypoint.sh

@@ -1,7 +1,23 @@
 #!/bin/sh
-INTERVAL=${CHECK_INTERVAL_HOURS:-3}
+set -eu
 
-echo "0 */$INTERVAL * * * /usr/local/bin/python3 /app/app/probe.py >> /proc/1/fd/1 2>&1" | crontab -
+INTERVAL=${CHECK_INTERVAL_HOURS:-3}
+CRON_ENV=/run/arena-dashboard.env
+
+# cron starts jobs with a minimal environment, so persist the variables that
+# probe.py needs instead of relying on the daemon inheriting container env.
+umask 077
+{
+  printf 'DB_PATH=%s\n' "${DB_PATH:-/data/arena.db}"
+  printf 'OMNIROUTE_URL=%s\n' "${OMNIROUTE_URL:-http://192.168.1.101:20128}"
+  printf 'OMNIROUTE_API_KEY=%s\n' "${OMNIROUTE_API_KEY:-}"
+  printf 'CHECK_TIMEOUT=%s\n' "${CHECK_TIMEOUT:-30}"
+  printf 'CHECK_CONCURRENCY=%s\n' "${CHECK_CONCURRENCY:-5}"
+} > "$CRON_ENV"
+
+cat <<EOF | crontab -
+0 */$INTERVAL * * * set -a; . $CRON_ENV; set +a; /usr/local/bin/python3 /app/app/probe.py >> /proc/1/fd/1 2>&1
+EOF
 cron
 
 cd /app/app