Test update notices.json (#351)

notices.json

@@ -15,7 +15,26 @@
       }
     }
   },
- {
+  {
+    "id": "server_upgrade_v8.1",
+    "conditions": {
+      "audience": "sysadmin",
+      "clientType": "all",
+      "serverVersion": ["<8.1"],
+      "instanceType": "onprem",
+      "displayDate": ">= 2023-08-28T00:00:00Z"
+    },
+    "localizedMessages": {
+      "en": {
+        "title": "Mattermost 8.1 is here!",
+        "description": "Mattermost v8.1 is the newest Extended Support Release. [Upgrading](https://docs.mattermost.com/upgrade/upgrading-mattermost-server.html) only takes a few minutes.",
+        "image": "https://raw.githubusercontent.com/mattermost/notices/master/images/server_upgrade.png",
+        "actionText": "Learn more",
+        "actionParam": "https://docs.mattermost.com/install/self-managed-changelog.html/?utm_source=inapp-self-hosted&utm_medium=popup&utm_campaign=mattermost-7-5-&utm_id=nov-notifications&utm_content=7-5-available"
+      }
+    }
+  },
+  {
     "id": "server_upgrade_v7.10-1",
     "conditions": {
       "audience": "sysadmin",