Add AWS environment variables to action

.github/workflows/update-superdataset.yml

@@ -12,3 +12,5 @@ jobs:
         uses: templateflow/actions-template@main
         env:
           SECRET_KEY: ${{ secrets.NIPREPS_BOT }}
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}