feat: add update indicator (#1626)

packages/api/src/router/update-checker.ts

@@ -0,0 +1,11 @@
+import { updateCheckerRequestHandler } from "@homarr/request-handler/update-checker";
+
+import { createTRPCRouter, protectedProcedure } from "../trpc";
+
+export const updateCheckerRouter = createTRPCRouter({
+  getAvailableUpdates: protectedProcedure.query(async () => {
+    const handler = updateCheckerRequestHandler.handler({});
+    const data = await handler.getCachedOrUpdatedDataAsync({});
+    return data.data.availableUpdates;
+  }),
+});