feat: enable automatic updates for ghost-1 container

Added dockcheck label to enable automatic container updates for the
ghost-1 photo blog service, ensuring it stays current with latest
security patches and features.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

roles/docker/templates/ghost-1-compose.yml.j2

@@ -17,7 +17,7 @@ services:
       glance.icon: si:ghost
       glance.url: https://{{ subdomains.phlog }}/
       glance.description: Photo Blog
-
+      mag37.dockcheck.update: true
 volumes:
   ghost:
     driver: local