set the gh env correctly this time

Author: jakubbalas

.github/workflows/nextjs.yml

@@ -40,7 +40,7 @@ jobs:
       #     cache: ${{ steps.detect-package-manager.outputs.manager }}
       - name: Set Environment Variables
         env:
-          BASE_PATH: /brno.python.pizza
+          run: echo "BASE_PATH=/brno.python.pizza" >> $GITHUB_ENV
       - name: Setup Pages
         uses: actions/configure-pages@v5
         with: