Add borgbackup server

Use alpine 3.23

frontend/public/json/alpine-borgbackup-server.json

@@ -0,0 +1,44 @@
+{
+  "name": "Alpine-BorgBackup-Server",
+  "slug": "alpine-borgbackup-server",
+  "categories": [
+    7
+  ],
+  "date_created": "2026-02-16",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://www.borgbackup.org/",
+  "website": "https://www.borgbackup.org/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/borg.webp",
+  "config_path": "",
+  "description": "Alpine-BorgBackup-Server is a lightweight containerized backup server based on Alpine Linux and BorgBackup. It provides a secure and efficient way to manage your backups with minimal resource usage, making it ideal for Proxmox VE environments.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/alpine-borgbackup-server.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 1024,
+        "hdd": 20,
+        "os": "alpine",
+        "version": "3.23"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "type": "info",
+      "content": "After installation, use the 'update' option in the script to configure SSH access and/or password authentication."
+    },
+    {
+      "type": "info",
+      "content": "Refer to the official BorgBackup documentation for setup and usage instructions."
+    }
+  ]
+}