feat: add rss widget (#760)

Co-authored-by: SeDemal <demal.sebastien@bluewin.ch>

packages/widgets/src/rssFeed/serverData.ts

@@ -0,0 +1,21 @@
+"use server";
+
+import { api } from "@homarr/api/server";
+
+import type { WidgetProps } from "../definition";
+
+export default async function getServerDataAsync({ itemId }: WidgetProps<"rssFeed">) {
+  if (!itemId) {
+    return {
+      initialData: undefined,
+      lastUpdatedAt: null,
+    };
+  }
+  const data = await api.widget.rssFeed.getFeeds({
+    itemId,
+  });
+  return {
+    initialData: data?.data,
+    lastUpdatedAt: data?.timestamp,
+  };
+}