Allow the NetBox image through the ghcr remote

NetBox is being deployed to k8s (argocd-apps) as the source of truth for
host/interface/IPAM data. Its image is ghcr.io/netbox-community/netbox, pulled
through the artifactapi ghcr mirror, so add the ^netbox-community/ pattern to
the ghcr remote allowlist.

Claude-Session: https://claude.ai/code/session_015ur3i7D2azsMAWTSVABApv

config/remote_docker/ghcr.yaml

@@ -10,6 +10,7 @@ patterns:
   - "^goauthentik/"
   - "^home-operations/"
   - "^jellyfin/"
+  - "^netbox-community/"
   - "^onedr0p/"
   - "^open-webui/open-webui"
   - "^openvoxproject/"