Add Next.js export step to workflow

Added a step to export static files using Next.js.

Author: raitucarp

.github/workflows/nextjs.yml

@@ -84,6 +84,9 @@ jobs:
         run: ${{ steps.detect-package-manager.outputs.manager }} ${{ steps.detect-package-manager.outputs.command }}
       - name: Build with Next.js
         run: ${{ steps.detect-package-manager.outputs.runner }} next build
+      - name: Export with Next.js
+        # produce the static ./out directory used by upload-pages-artifact
+        run: ${{ steps.detect-package-manager.outputs.runner }} next export
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: