add caching for public assets

backend/src/main.ts

@@ -21,7 +21,9 @@ async function bootstrap() {
     const { port, corsOrigins, nodeEnv } = configService.get('app') as Config['app'];
 
     app.useStaticAssets(getPublicUploadsDir(), {
-        prefix: publicUploadsUrlPrefix
+        prefix: publicUploadsUrlPrefix,
+        maxAge: '1y',
+        immutable: true
     });
 
     const storefrontPublicDir = path.join(__dirname, 'modules', 'storefrontCore', 'public');