fix: set NEXT_PUBLIC_BASE_URL=https://icube-app.com in deploy workflow

The env var was not being set during CI builds, causing the AltStore/
SideStore feed and download page to use the fallback URL. This ensures
all absolute URLs in the static build point to the correct domain.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: JoeMatt

.github/workflows/deploy.yml

@@ -40,6 +40,8 @@ jobs:
 
       - name: Build with Next.js
         run: npm run build
+        env:
+          NEXT_PUBLIC_BASE_URL: https://icube-app.com
 
       - name: Write build SHA
         run: echo "${{ github.sha }}" > ./out/build-sha.txt