debug try7: environment secrets again

Author: johnnychen94

.github/workflows/docs.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           host: ${{ secrets.MIRROR_SERVER_HOST }}
           username: ${{ secrets.MIRROR_SERVER_USERNAME }}
-          key: ${{ secrets.MIRROR_SERVER_SSH_KEY }}
+          key: ${{ secrets.MIRROR_SERVER_SSH_KEY_TEST }}
           # source: "doc/build"
           # target: "/gs/JuliaZH.jl/"
           source: "doc"