Add cache control header (#155)

* add cache-control header to CSR server

add a maxAge configuration = 1 year for CSR simple server to match what SSR server automatically configures

* Update utils.ts

* Update utils.ts

* Update utils.ts

* update maxAge to have traditional seconds-calendar year calculation

Author: sjjj986

packages/@apphosting/adapter-angular/src/simple-server/server.mjs

@@ -4,8 +4,9 @@ import { fileURLToPath } from "url";
 const app = express();
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
+const oneYear = 31_536_000_000;
 
-app.use(express.static(path.join(__dirname, "..", "browser")));
+app.use(express.static(path.join(__dirname, "..", "browser"), { maxAge: oneYear }));
 app.get("*", function (request, response) {
   response.sendFile(path.join(__dirname, "..", "browser", "index.html"));
 });