debug try8: reference to github-pages environment

Author: johnnychen94

.github/workflows/docs.yml

@@ -29,6 +29,7 @@ jobs:
       #     julia -e 'include("contrib/build_sysimg.jl"); build_sysimg(force=true)'
       #     julia --project=doc/ doc/make.jl deploy
       - name: deploy to juliacn docs server
+        environment: github-pages
         uses: appleboy/scp-action@master
         with:
           host: ${{ secrets.MIRROR_SERVER_HOST }}