Fix rollouts:create to handle backend regionality & other fixes

CHANGELOG.md

@@ -1 +1,2 @@
+- Fix rollouts:create to handle backend regionality & other fixes. (#7862)
 - Fixed Next.js issue with PPR routes not rendering correctly. (#7625)

src/apphosting/index.spec.ts → src/apphosting/backend.spec.ts

@@ -13,7 +13,7 @@ import {
   setDefaultTrafficPolicy,
   ensureAppHostingComputeServiceAccount,
   getBackendForAmbiguousLocation,
-} from "./index";
+} from "./backend";
 import * as deploymentTool from "../deploymentTool";
 import { FirebaseError } from "../error";