set config via feature flags (#6590)

In cloud environment, allow all the config values to be set by the
feature flag endpoint and be updated dynamically (on 30s poll). Retain
origianl behavior for OSS. On cloud, config changes shouldn't be changed
via redeploy and the promoted image should match the staging image.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6590-set-config-via-feature-flags-2a26d73d3650819f8084eb2695c51f22)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL0424@gmail.com>

src/config/firebase.ts

@@ -1,5 +1,8 @@
 import type { FirebaseOptions } from 'firebase/app'
 
+import { isCloud } from '@/platform/distribution/types'
+import { remoteConfig } from '@/platform/remoteConfig/remoteConfig'
+
 const DEV_CONFIG: FirebaseOptions = {
   apiKey: 'AIzaSyDa_YMeyzV0SkVe92vBZ1tVikWBmOU5KVE',
   authDomain: 'dreamboothy-dev.firebaseapp.com',
@@ -22,7 +25,18 @@ const PROD_CONFIG: FirebaseOptions = {
   measurementId: 'G-3ZBD3MBTG4'
 }
 
-// To test with prod config while using dev server, set USE_PROD_CONFIG=true in .env
-export const FIREBASE_CONFIG: FirebaseOptions = __USE_PROD_CONFIG__
-  ? PROD_CONFIG
-  : DEV_CONFIG
+const BUILD_TIME_CONFIG = __USE_PROD_CONFIG__ ? PROD_CONFIG : DEV_CONFIG
+
+/**
+ * Returns the Firebase configuration for the current environment.
+ * - Cloud builds use runtime configuration delivered via feature flags
+ * - OSS / localhost builds fall back to the build-time config determined by __USE_PROD_CONFIG__
+ */
+export function getFirebaseConfig(): FirebaseOptions {
+  if (!isCloud) {
+    return BUILD_TIME_CONFIG
+  }
+
+  const runtimeConfig = remoteConfig.value.firebase_config
+  return runtimeConfig ?? BUILD_TIME_CONFIG
+}