Add max job timeout for build workflow (vercel#50998)

Ensures we don't allow jobs like this one back up the queue indefinitely https://github.com/vercel/next.js/actions/runs/5214838162/jobs/9411777984?pr=50904

Author: ijjk

.github/workflows/build_reusable.yml

@@ -51,6 +51,7 @@ env:
 
 jobs:
   build:
+    timeout-minutes: 25
     runs-on: [self-hosted, linux, x64]
 
     steps: