add NUT Server to the catalog

- NUT Server (instantlinux/nut-upsd) runs the Network UPS Tools server for a UPS connected to the host by USB: the installation proposes the UPS the host detects, passes it to the container, generates the password of the upsmon user and starts with the host; clients such as PeaNUT connect on port 3493.
- A recipe can ask for the UPS of the host: without one, the installation stops and says so, and the advanced installation lets the node be typed by hand.
- The catalog lists 335 applications.
- Tests for the proposed UPS, a host without one and the recipe.

oci/catalog/index.json

@@ -7154,6 +7154,38 @@
       "hidden": false,
       "template_id": "image-node-red"
     },
+    {
+      "id": "nut-server",
+      "provider": "instantlinux",
+      "template_family": "curated-profile",
+      "title": "NUT Server",
+      "repository": "https://github.com/instantlinux/docker-tools",
+      "description": "Network UPS Tools server for a UPS connected to the host by USB.",
+      "website": "https://networkupstools.org/",
+      "icon": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/network-ups-tools.webp",
+      "architectures": [
+        "amd64",
+        "arm64"
+      ],
+      "updated_at": null,
+      "main_image": "instantlinux/nut-upsd:latest",
+      "category": "monitoring",
+      "category_label": "Monitoring & Analytics",
+      "replaces_discovered_ids": [],
+      "curated_path": "catalog/curated/nut-server.json",
+      "template": "apps/nut-server.json",
+      "template_status": "generated-unvalidated",
+      "automatic_install_candidate": true,
+      "untranslated_blockers": [],
+      "requires_privileged_lxc": false,
+      "optional_privileged_lxc": false,
+      "requires_host_pid_namespace": false,
+      "requires_relaxed_confinement": false,
+      "optional_relaxed_confinement": false,
+      "requires_security_confirmation": false,
+      "hidden": false,
+      "template_id": "image-nut-server"
+    },
     {
       "id": "nzbfast",
       "source_app_id": "nzbfast",