feat: add dockcheck cron job for container update notifications

- Install dockcheck.sh script in user's .local/bin directory
- Create notification templates directory with notify_v2.sh and notify_gotify.sh
- Configure Gotify notifications for container update alerts
- Add minimal config with DontUpdate=true (notification only)
- Exclude authentik-postgresql-1 and dawarich_redis from checks
- Schedule daily cron job at 8:00 AM as phil user
- Add dockcheck Gotify token to vault secrets

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

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

roles/cron/templates/dockcheck.config.j2

@@ -0,0 +1,16 @@
+# Dockcheck Configuration - Check only, no updates
+# Don't update, just check for updates
+DontUpdate=true
+
+# Enable notifications
+Notify=true
+
+# Exclude containers from checking
+Exclude="authentik-postgresql-1,dawarich_redis"
+
+# Notification channels
+NOTIFY_CHANNELS="gotify"
+
+# Gotify notification configuration
+GOTIFY_DOMAIN="https://{{ subdomains.gotify }}"
+GOTIFY_TOKEN="{{ vault_dockcheck.gotify_token }}"