fix(build): fsRouterFiles were not included during static build (#1139)

fixes #1124

---------

Co-authored-by: Tyler <[email protected]>
Co-authored-by: Daishi Kato <[email protected]>

Author: tylersayshi

packages/waku/src/lib/builder/build.ts

@@ -749,6 +749,7 @@ export async function build(options: {
   const cssAssets = clientBuildOutput.output.flatMap(({ type, fileName }) =>
     type === 'asset' && fileName.endsWith('.css') ? [fileName] : [],
   );
+  platformObject.buildOptions.unstable_phase = 'emitStaticFiles';
   await emitStaticFiles(
     rootDir,
     config,

packages/waku/src/server.ts

@@ -33,7 +33,8 @@ type PlatformObject = {
       | 'buildServerBundle'
       | 'buildSsrBundle'
       | 'buildClientBundle'
-      | 'buildDeploy';
+      | 'buildDeploy'
+      | 'emitStaticFiles';
   };
 } & Record<string, unknown>;