changed app linkding: testing env variables

apps/linkding/config.json

@@ -14,6 +14,24 @@
   "source": "https://github.com/sissbruecker/linkding",
   "website": "https://www.linkding.link/",
   "supported_architectures": ["arm64", "amd64"],
+  "form_fields": [
+    {
+      "type": "text",
+      "label": "Initial superuser name",
+      "max": 50,
+      "required": true,
+      "placeholder": "admin",
+      "env_variable": "SUPERUSER_NAME"
+    },
+    {
+      "type": "password",
+      "label": "Initial superuser password",
+      "max": 50,
+      "min": 6,
+      "required": true,
+      "env_variable": "SUPERUSER_PASSWORD"
+    }
+  ],
   "created_at": 1763331296327,
   "updated_at": 1763333712520
 }