fix: install curl in dns-updater container

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/deploy/docker/docker-compose.yml

@@ -90,7 +90,7 @@ services:
       - ./update-dns.sh:/update-dns.sh:ro
     secrets:
       - cf_api_token
-    entrypoint: ["/bin/sh", "/update-dns.sh"]
+    entrypoint: ["/bin/sh", "-c", "apk add --no-cache curl > /dev/null 2>&1 && /bin/sh /update-dns.sh"]
     environment:
       DNS_UPDATE_INTERVAL: "300"  # 5 minutes