Pin DNS to 1.1.1.1/8.8.8.8 in docker-compose

Chromium in the container was failing with ERR_INTERNET_DISCONNECTED
when navigating to Reddit. Override container DNS to public resolvers
so the browser can reach reddit.com / chat.reddit.com.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker-compose.yml

@@ -5,6 +5,9 @@ services:
     build: .
     container_name: reddit-bot
     restart: unless-stopped
+    dns:
+      - 1.1.1.1
+      - 8.8.8.8
     # Mount the data directory to persist the database and browser session
     volumes:
       - ./data:/app/data