feat: create a banner with custom text by admin

packages/trpc/server/banner-router/router.ts

@@ -0,0 +1,27 @@
+import { TRPCError } from '@trpc/server';
+
+import { upsertBanner } from '@documenso/lib/server-only/banner/upsert-banner';
+
+import { adminProcedure, router } from '../trpc';
+import { ZCreateBannerByAdminSchema } from './schema';
+
+export const bannerRouter = router({
+  updateBanner: adminProcedure
+    .input(ZCreateBannerByAdminSchema)
+    .mutation(async ({ input, ctx }) => {
+      const { show, text } = input;
+
+      try {
+        return await upsertBanner({
+          userId: ctx.user.id,
+          show,
+          text,
+        });
+      } catch (err) {
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: 'We were unable to update your banner. Please try again.',
+        });
+      }
+    }),
+});