fix submission env_var

Author: mgoerens

.github/workflows/build.yml

@@ -156,7 +156,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: submission
-          path: ${{ github.env.SUBMISSION_PATH }}
+          path: ${{ env.SUBMISSION_PATH }}
 
       - name: Add 'content-ok' label
         uses: actions/github-script@v7